Ruth Mosby is the VP of operations at Serenity Acres, where the privileged elite go to die. For a hefty fee, wealthy retirees can live the good life in this posh Santa Barbara community—even after they outlive their money. Ruth thinks this is a fine arrangement, but the savvy new boss has a new rule: if you can’t pay, you can’t stay. Ruth is deeply disturbed when destitute residents start dying at an alarming rate, as if on cue. Even more troubling, a macabre note accompanies each departed guest. Surviving guests whisper about an “Angel” who assists with suicides. Ruth has another word for it: murder.