At sixty-five, Hornclaw is beginning to slow down. She lives modestly in a small apartment, with only her aging dog, a rescue named Deadweight, to keep her company. There are expectations for people her age—that she'll retire and live out the rest of her days quietly. But Hornclaw is not like other people. She is an assassin.

Double-crossers, corporate enemies, cheating spouses—for the past four decades, Hornclaw has killed them all with ruthless efficiency, and the less she's known about her targets, the better. But now, nearing the end of her career, she has just slipped up. An injury leads her to an unexpected connection with a doctor and his family. But emotions, for an assassin, are a dangerous proposition. As Hornclaw's world closes in, this final chapter in her career may also mark her own bloody end.