Die. Die with me. Be mine forever. That's what he had said.

When fourteen-year-old Gemma Kramer's broken body is found on the floor of St. Sebastian's Church in a quiet London suburb, the official ruling is that she jumped to her death from the organ gallery. But when a witness claims to have seen Gemma kissing a much older man outside shortly beforehand, and a toxicology report reveals traces of a date-rape drug in the girl's system, a murder investigation is launched.

At the helm is Mark Tartaglia, a stubborn detective known for following his hunches. It's Tartaglia's first time in charge, and he walks right into a political minefield as the murder squad turns up three more suspicious deaths -- all originally ruled suicides -- involving vulnerable young women falling from high places. Can Tartaglia and his team connect the dots between victims in order to find a serial killer with a chilling predilection for lonely girls and deadly heights?