The Midnight Side by Natasha Mostert

"The MIDNIGHT SIDE is Natasha Mostert’s critically acclaimed debut novel, which tells the story of an incredibly seductive woman, who even from the grave is able to direct events to her satisfaction. Isa is not surprised by a late night telephone call from her cousin Alette, until she discovers the next morning that Alette has been dead for two days... Then Isa receives three sealed envelopes and a final request from Alette. The envelopes contain instructions on how to bring about the financial ruin of handsome, successful Justin Temple: the man who made Alette’s life a misery while she was still alive. But as Isa travels to London to set Alette’s elaborate plan of revenge in motion, she is in peril. Unbeknownst to her, Alette was murdered and now it is Isa’s turn to be drawn into the killer’s world of dark fantasy and lethal obsession."