After an overhaul of leadership at the FBI's New York field office, A. X. L. Pendergast is abruptly forced to accept an unthinkable condition of continued employment: the famously rogue agent must now work with a partner. Pendergast and his new teammate, junior agent Coldmoon, are assigned to Miami Beach, where a rash of killings by a bloodthirsty psychopath are distinguished by a confounding M.O.: cutting out the hearts of his victims and leaving them - along with cryptic handwritten letters - at local gravestones, unconnected save in one bizarre way: all belonged to women who committed suicide.