2 Sisters Murder Investigations: A Thriller by James Patterson and Candice Fox is the second book in the 2 Sisters Detective Agency Mystery series, published by Little, Brown and Company. This 368-page trade paperback follows half-sisters Rhonda and Barbara "Baby" Bird, full partners in their Los Angeles detective agency who agree on nothing.

Rhonda, a former attorney, takes a by-the-book approach to solving crimes, while teenage Baby relies on her street smarts. When they take a controversial case of a loner whose popular wife has gone missing, they're accused of being PIs who can't tell a client from a killer. The Bird sisters share a late father, but not much else — except their willingness to fight the system, fight for the underdog, and fight for the truth.

ISBN-13: 9781538758472. Published April 22, 2025.