The Deadly Sister by Eliot Schrefer 310 pages

Abby has always been her little sister's protector. When Maya's boyfriend turns up dead and Abby finds Maya's phone next to the corpse, she fears the worst. Here is a mystery with a lot of red herrings and the reader is not sure whether to even trust the narrator. Even Jefferson, the perfect boyfriend is not who he seemed. The ending is a knock-out.