Siblings love, disparage, look out for and cover up for one another all of their lives. But how do you love or cover up for a sister who kills her boyfriends and then develops a fixation for a man whom you long to love? Do you tip him off? Do you stop your sister? Or do you stand back? That's the plot at the heart of a dark comedy enlivened by a deadpan wit by the Nigerian novelist Oyinkan Braithwaite. Her book is "My Sister, The Serial Killer."
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