Robert B. Parker's Payback

In her latest thrilling adventure, PI Sunny Randall takes on two serpentine cases that converge into one deadly mystery. PI Sunny Randall has often relied on the help of her best friend Spike in times of need. When Spike's restaurant is taken over under a predatory loan agreement, Sunny has a chance to return the favor. She begins digging into the life of the hedge fund manager who screwed Spike over - surely a guy that smarmy has a skeleton or two in his closet - and soon finds this new enemy may have the backing of even badder criminals.
At the same time, Sunny's cop contact Lee Farrell asks her to intervene with his niece, a college student who reported being the victim of a crime but seems to know more than she's telling police. As the uncooperative young woman becomes outright hostile, Sunny runs up against a wall that she's only more determined to scale. Then, what appear to be two disparate cases are united by a common factor, and the picture becomes even more muddled.
But one thing is clear: Sunny has been poking a hornet's nest from two sides, and all hell is about to break loose.