Debby Morris, mother of two, goes to a Christmas party at the historic Hollyhock Manor in Marlow, and never comes home.
Her phone, handbag and Santa's elf hat are found in a park near the River Thames. The police issue a nationwide search, but Debby is not found.
Planned disappearance or something more sinister?
Then Debby's body, still in her elf costume, is discovered five miles downstream from where she disappeared.
But the circumstances around Debby's death are murkier than the Thames in which she was found.
Detective Rob Miller is pulled from compassionate leave and put in charge. He's still reeling from his last botched case, and now all eyes are on him - waiting to see if he'll crack.
As if saving his career isn't enough, Rob and his team are now in a race against time to bring an ingenious killer to justice.
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