In this auspicious debut, Alex Dolan announces himself as a virtuoso of psychological suspense and a rightful heir to masters of the genre like Gillian Flynn and Megan Abbott. A young woman helps to end the lives of people with terminal diseases, her reasons her own. When she helps the wrong person, she will be roped into a plot to gain vengeance on behalf of dozens. Her journey will make her question everything she ever thought she knew about herself. And the last life she ends may be her own.

They know her as Kali. She is there to see them off into the afterlife with kindness, with...