My Sister, the Serial Killer by Oyinkan Braithwaite
Korede always cleans up her younger sister Ayoola’s messes. It’s her job as the older sibling to protect her sister. Ayoola has a habit of murdering her boyfriends, and Korede is always there to cover for her. When Ayoola sets her sights on the man Korede is in love with, however, Korede isn’t sure she can protect her sister any longer. This is a darkly funny and slightly disturbing tale of sibling rivalry. The prose is spare but the characters shine.