R is for Ricochet by Sue Grafton

Kinsey is hired by wealthy Nord Lafferty to escort his daughter, Reba, back home after she's released from prison. Kinsey finds herself liking Reba and wanting her to succeed on the outside, so Kinsey spends time with her. Soon, however, Kinsey is embroiled in Reba's relationship with shady businessman Alan "Beck" Beckwith. In fact, Reba had taken the fall for Beck because she was in love with him. When the U.S. government asks for Kinsey's help in getting Reba to help them go after Beckwith, Kinsey is apprehensive. Will the situation end with justice served or in tragedy?