Blue Screen by Robert B. Parker

In Blue Screen Sunny Randall is hired by Buddy Bollen, a movie producer who lives in Jesse Stone's Paradise, to protect his main lay, Erin Flint, a B-movie actress. When Erin's sister is murdered, Erin asks Randall to investigate and this brings her in contact with Jesse Stone. The investigation involves the usual Robert B. Parker scene of the detective discussing the case with a local mobster, a close friend, and an intimate friend, shuffling to and back from another big city, discussions on the nature of human nature, and all the other Robert B. Parker stuff.