He obliges her, finding her son, who has been in Canada since the 1960s, evading the law since he was a Vietnam War protester. A simple favor, melancholy, but benign. Except that before he can get settled back in Detroit, Garnet's son is dead, and Walker is the prime suspect.
He has little choice but to find out who might have done the deed and tried to pin the blame on him...and in the process he discovers another murder, of a prizefighter from the 1940s. Curtis Smallwood was the father of Beryl Garnet's son. And if that wasn't bad enough, the two murders, 53 years apart, were committed with the same gun.