On a glorious Sunday morning in September, an old man is found beaten to death in a rundown alleyway off Ottawa's Byward Market. Initially, the killing appears to be a mugging gone wrong, and suspicion falls on four local gang punks caught on a nearby store surveillance camera. However, the mystery deepens when the victim is identified as a retired psychiatrist whose controversial treatment methods often put him at odds with his colleagues and his patients' families. Inspector Green discovers that the doctor recently changed his will to disinherit his estranged son and to benefit several former patients whom he believed he had failed. Green races to track down a mysterious young visitor, desperate to find her ahead of the gang, but unprepared for the final solution, which leaves him grappling with the ultimate meaning of justice.