Midnight Cab — James W. Nichol

A three-year-old boy is found abandoned and clinging to a wire fence at the side of a country road, terrified. Sixteen years later, Walker Devereaux is in Toronto to discover the truth about his biological mother and start his life in the city. Working as a cabdriver, Walker befriends Krista, a pretty, demanding, wheelchair-bound night dispatcher. Krista and Walker are fast friends, and she can't help but involve herself with Walker's quest to understand his shrouded identity. Soon enough, though, their little off-hours sleuthing turns perilous as they come within the deadly grasp of a man whose own early abandonment has turned him into a desperate and violent psychopath.