Holmes, Marple & Poe (A Holmes, Margaret & Poe Mystery) by James Patterson, Brian Sitts

In this thrilling story of crime and corruption from the world’s #1 bestselling author, three detectives keep their identities secret, and NYPD’s Det. Helene Grey is on a mission to unmask them—no matter who gets killed along the way.
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In New York City, three intriguing, smart, and stylish private investigators open Holmes, Marple & Poe Investigations. Who are these detectives with famous names and mysterious, untraceable pasts?

Brendan Holmes—The Brain: Identifies suspects via deduction and logic.

Margaret Marple—The Eyes: Possesses powers of observation too often underestimated.

Auguste Poe—The Muscle: Chases down every lead no matter how dangerous or dark.

The agency’s daring methodology and headline-making solves attract the attention of NYPD Detective Helene Grey. Her solo investigation into her three unknowable competitors rivals the best mysteries of Sir Arthur Conan-Doyle, Agatha Christie, and Edgar Allan Poe.