Murdoch makes a surprising discovery at a dolls house fair; in one of the houses the artist has placed a hand firing a gun. This is no ordinary model - it’s a crime scene. Murdoch finds the creator of the streetscape, an autistic 19-year-old, Lydia, who communicates best through model building. No one has reported a murder yet, but using the model’s intricate clues left by Lydia, Murdoch disco