My Sister The Serial Killer is exactly what it sounds like: a sharp, slim, pulpy little thriller with gory details and a pace that will leave you with enough time to drive it over to a friend’s house to lend for the evening. It’s the story of two sisters living in a vividly described Lagos, Nigeria, and it joyfully makes use of certain tropes. Ayoola, the killer of the title, is thoughtless and beautiful, while Korede is the older, responsible, more dull sister. Ayoola has a tendency to kill her boyfriends, and when a doctor whom Korede has a crush on shows some interest in Ayoola … things get complicated. The book is darkly funny and moves at breakneck speed, but still manages to ask a hard question: Why do women kill? And … why don’t they?