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Not long after the Hollisters, Indy, and Emmy Roades arrive on Wicket-ee-nock Island, they discover that something is very much amiss. The Franklins, who live on the island, seem to be hiding something in their barn. The Franklins warn them not to go near the barn! A prowler is seen near the abandoned inn where the Hollisters are staying.Later, their belongings are ransacked, and they receive a fake telegram, supposedly from Mrs. Hollister, ordering them to return home. Then, one night, the ghost horse looks eerily out of the fog.When the Hollisters realize that someone is trying to scare them off the island, they are determined to find out why.A man with a beard and a foreign accent saves them from drowning but then disappears into the night. A pair of Lipizzan horses, a scrap of paper bearing a coat of arms, and a secret tunnel provide several clues, and after experiencing some harrowing moments, the Hollisters set out to find the valuable diamond-encrusted coat of arms that is the heart of the mystery of the ghost horse!In the process, they learn a great deal about the work of the Audubon Society and about the training of the world-famous Lipizzaners.The author thanks The National Audubon Society for its courteous assistance in the preparation of this story.

While watching TV, Pete Hollister hears about a train robbery in New England. Masked bandits have stolen almost a million dollars in cash from a mail car!At the same time, the Hollisters receive a request from their friend, Fritz, the old wood carver in Germany. Can the Hollisters go to a museum in nearby Foxboro and get him the dimensions of a wooden Indian called the "Settlers' Friend"?"Foxboro!" Pete exclaims. "That's where the train robbery happened today!" Naturally, the Hollisters' instinct for detective work is instantly aroused.Indy Roades, the Pueblo Indian who works for Mr. Hollister, and his sister, Snow Flower, volunteer to take the children to the New England town. In no time at all, the Hollisters are deeply involved in tracking down the train robbers and the robbers of the Settlers' Friend which has disappeared from the museum.Ricky is accidentally kidnapped . . . Pam falls through a hole in an old covered bridge . . . a terrible hurricane engulfs them all . . . and Sue makes friends with a family of groundhogs, or "whistle-pigs," never suspecting that these little creatures will play a big part in helping the Hollisters solve both mysteries.All kinds of escapades involve the Happy Hollisters in this new suspense thriller which takes them only a short distance from home and introduces them to a lot of fascinating Americana.

In this thrilling new adventure, the Happy Hollisters travel to the beautiful land of Italy to help their friend, Nada Boschi find her Uncle Giovanni, a famous toymaker and puppeteer, who has disappeared from his house in Rome. Nada is sure that he has been kidnapped. But why would anyone want to kidnap a kind old man who spends his time entertaining children? The Hollisters are eager to try their hand at solving the mystery and help Nada find her uncle. But all this has happened in Italy-half-way around the world from Shoreham. There seems to be nothing that they can do.Then Pam learns that she has won first prize in a contest-a trip around the world . . . and, well-almost before Pete can say "Crickets!" Mrs. Hollister and her children find themselves in the beautiful land of Italy.Here they have a wonderful time riding a gondola through the famous "streets of water" in Venice . . . climbing to the top of the leaning tower of Pisa . . . shopping in the funny little stores that have been built on a bridge in the city of Florence . . . and visiting the ancient city of Pompeii which had been buried in the ash of a volcano over 2000 years ago!The Happy Hollisters have all kinds of adventures touring these and many other famous places in Italy. And, before their trip has ended, they not only find Uncle Giovanni but help the Italian police round up a gang of dangerous thieves!Paperback; 184 pages with 20 illustrations.

Business had originally brought the Hollister family to Europe. Then a new and exciting mystery led Pete, Pam, Holly, Ricky, Sue, and Mrs. Hollister on a thrilling chase while Mr. Hollister returned to America.High in the Swiss Alps, a suspicious stranger in a cable car dropped a large black key which the Hollisters found. An insurance investigator named Johann Meyer was following the stranger, an international jewel thief. Mr. Meyer told the Hollisters about his dangerous case-to find a large diamond that had been stolen from Holland. When Mr. Meyer's small plane was reported missing over the mountains, the Hollisters decided to help.The trail took them to a small village high in the mountains where Holly thought she saw the stranger again. But the man escaped before they could catch him. Then Pete and Pam discovered a ruined chalet which yielded another clue-a round metal disc that they later identified as a diamond saw. But who, they wondered, was blowing the long Alpine horn which echoed off the mountain peaks and where did the medallion necklace that Pam had found fit into the case?Clue piles on clue as the irrepressible Hollisters track down each new lead, learn about Swiss life and customs, rescue Mr. Meyer, and recover a valuable diamond.Paperback; 174 pages with 20 illustrations

It was a small note-written in German. Pete Hollister found it hidden in the door of a broken cuckoo clock. When the note was translated, the Hollister children were jubilant. The message was a riddle that made little sense to them-but it was the first clue in a brand-new mystery.Imagine their surprise when Mr. Hollister announced that the whole family-Pete, Pam, Holly, Ricky, and little Sue-were going to Germany to buy toys for their shop, The Trading Post. Now the children could find the wood carver who had made the cuckoo clock and ask him what the puzzling message meant.Just as the family prepared to board the jet for Europe, someone snatched the damaged clock from Ricky!When the children visited the famous old wood carver in the Black Forest town of Triberg, they began to untangle the riddle in the message. Then it became a race against a band of desperate thieves to find a valuable golden cuckoo clock which had been stolen from a German museum. It involved them in a wild chase and a thrilling boat ride down the Rhine.The Hollisters do their special sleuthing in a new setting and enjoy another fascinating mystery-adventure.Paperback; 179 pages with 20 illustrations.

An abandoned rock quarry, mysterious flying objects, and a valuable deposit of titanium lead the five Hollister children-Pete, Pam, Ricky, Holly, and Sue-into their latest thrilling adventure.When a package of instruments from a weather balloon is parachuted onto their front lawn, the Hollisters are baffled and very excited. Just what is the meaning of the orange parachute and its dangling white box? The Hollisters connect the balloon with the strange lights which have been appearing at night over their Shoreham home, and once again they start off on a trail of detection.A chance visit to a local "rock hound," a man who collects minerals, proves to be the clue to the puzzle. Then their detective work takes them to a fantastic, spooky rock quarry which turns out to be the location of a hidden laboratory for weather experiments and also the scene of an attempt to steal some valuable titanium.As always, the Hollisters have several breath-taking experiences along the way to solving their mystery. Pam accidentally falls into the cold, green waters of the quarry pool where a monster is said to live! Pete and Ricky inspect an old-fashioned open cockpit airplane and suddenly find themselves flying in the sky without a pilot-without knowing how to land!As the Castle Rock mystery thickens, the Hollisters make an unexpected visit to New York where they see their old friend Hootnanny Gandy who helps them get to the bottom of another fascinating adventure.Paperback; 170 pages with 20 illustrations.

One day Pete and Pam Hollister rescued a Seminole Indian named Charlie Tiger Tail from drowning in Pine Lake. But they never dreamed that their heroic act would lead to a new, exciting mystery and a vacation in Florida.Within a few days, all the Hollisters were enjoying the beach at Turtle Point in the Everglades. And they were eager to help Charlie catch a gang of thieves who were illegally killing giant sea turtles and stealing their eggs!After Holly found a poacher's spear, Ricky and Pete patrolled the beach one night and almost trapped the poachers. With Charlie's ten-year-old daughter, Clementine, the children rowed to mysterious Captive Island to investigate the eerie sounds coming from there each night. They inspected a great Mississippi riverboat that had been towed up on land and turned into a huge mansion. And they visited Clementine's grandmother in a Seminole village where the boys learned how to pole a real dugout canoe.There were many more thrilling adventures-including Ricky's capture by the thieves-before the Hollisters finally traced the poachers to their hideout and solved the sea turtle mystery.Paperback; 174 pages with 20 illustrations.