It's Christmas!
A year since their last case, and Adam and Colin are called out of semi-retirement when Stonebridge legend and regular town Santa, Gerald Agnew, is found dead in the snow.
The police believe his death to be a drunken accident, but evidence that our amateur detectives uncover points to something more sinister.
When DI Whitelaw dismisses their claims, Adam and Colin must navigate drug dealers, deception, and department store Santas to get to the truth.