Switchback — Collin Wilcox

In the shadows of the Golden Gate Bridge, Hastings investigates a glamorous murder
The killer is long gone from the crime scene when he realizes his mistake. It went perfectly, right until the end. He lured Lisa to the oceanfront park, entered her car on the passenger side, shot her twice, and escaped without being stained by her blood. He took the gun with him, as planned -- but he forgot her purse, the crucial detail meant to make the crime look like a robbery. It was a simple mistake, but it could cost him everything.
It does not take long for Lieutenant Frank Hastings to notice the purse -- nor is he slow to notice the victim's beauty. Lisa Franklin was a self-described courtesan, a would-be poet who paid her rent by lavishing affection on San Francisco's rich and powerful. As Hastings combs through her client list, he is confronted with one vital question: Which captain of industry was foolish enough to leave the purse behind?