A banker with a smile that conceals a devilish impulse, a literary agent who is quick to anger, a mechanic with a desperate need to be liked, and a psychologist who keeps all their secrets— as well as his own— meet every week in the dingy back room of a New York City bar. These men have one thing in common: They all suffer the sting of a broken heart.

Soon, anger turns to hate, and the Broken Hearts Club spins violently out of control, exploding into murderous acts of vengeance. Detective Conrad Voort is assigned the case, determined to catch an elusive killer who is always one death ahead and who knows how to cover his tracks with cold efficiency— appearing to switch identities with each new victim. Breaking up may be hard to do— but with the Broken Hearts Club, it's fatal.