Sociopath's Guide to a Successful Marriage by MK Oliver

 Meet Lalla Rook. Lalla has a lot on her plate: She needs to guarantee her husband makes partner, secure her dream house in Hampstead, and get her daughter into a prestigious prep school. And on the afternoon she stabs a stranger seven times after he breaks into her living room, she has a four-year-old’s birthday party to host. With an unambitious partner, two demanding children, and a barely adequate large house in a nice (if not quite fashionable) part of town, Lalla’s life isn’t quite perfect yet. And she can’t pretend she hasn’t missed the adrenaline rush that comes with transgressing. Besides, as a wife and mother, she’s already an expert multi-tasker. So, disposing of a body, framing a friend, and being the world’s best mother... easy.