Dark Heart: A True Story of Sex, Manipulation, and Murder

From the authors of the “true crime classic”* Notes on a Killing comes the harrowing story of the games that couples play—and what happens when role-playing becomes a deadly reality.

Was murder part of the game?

Seventeen-year-old Kat McDonough grew up with theater in her blood—and a penchant for make-believe. More than a decade older, Seth Mazzaglia was well known in the community theater circle of Portsmouth, New Hampshire. He, too, had a rich inner life—and he soon had Kat convinced t...