Every Breath You Take — Michelle Spring

London-based P.I. Laura Principal and her old friend, Helen, love Wildfell cottage, their retreat on the Norfolk coast. But lately the upkeep has been a burden. A friend recommends an art teacher, Monica Harcourt, to share expenses. But Monica seems fearful. Laura finds out too late that someone was stalking Monica - someone who left Monica's slashed body in her Cambridge flat.