The Elder Brothers and the Keeper of Time

Is Cali a Time Keeper or is she remembering events that have already happened before time was changed?
Ten-year-old Cali must discover who Jamie and Nicky Elder are, and why it’s so important to reach the boys before the evilest warlock of all, Ostrogoth, can find the brothers and kill them!
Cali lives in Padstow Green, Cornwall, a hidden community of Specials, people with magical powers. She realizes that time has been changed. Before she can fix it, the warlocks attack, so Cali and the other villagers must flee.
But all is not lost. While in hiding, Cali meets Jamie and Nicky. She befriends the boys, teaches them about magic, and their adventures begin. Firstly, Nicky nearly kills Jamie with a spell. Then they journey to the now warlock-infested Padstow Green to find Goldhawk Springs, where they can enhance their magical talents.
However, time is running out. Ostrogoth is openly attacking Normals, non-magical people, and barricades are going up all over England. Anyone stopped without identification is detained.
After a warlock attacks the boys in a supposedly safe house, Cali, the boys, and their parents go on the run. Barely avoiding the relentless warlocks and the Normals soldiers alike, they travel from one end of England to the other, finally finding a place they can hide until the boys develop the skills necessary to challenge Ostrogoth, and either kill or be killed.
About the Author: C. J. Elgert grew up in Aylesbury, Buckinghamshire, England, a 1,000-year-old town named in the Domesday Book, a survey of England made in about 1086. Now retired, the author lives on Pender Island in British Columbia, Canada. The characters Jamie and Nicky are based on her two sons.