The Cutting Edge : Grand Central Publishing : 9781455536405 : 1455536407 : 07 May 2019 : Lincoln Rhyme and Amelia Sachs return to New York City to investigate a triple murder and confront a killer terrorizing couples at their happiest--and most vulnerable in this explosive New York Times bestseller. In the early hours of a quiet, weekend morning in Manhattan's Diamond District, a brutal triple murder shocks the city. Lincoln Rhyme and Amelia Sachs quickly take the case. Curiously, the killer has left behind a half-million dollars' worth of gems at the murder scene, a jewelry store on 47th street. As more crimes follow, it becomes clear that the killer's target is not gems, but engaged couples themselves. The Promisor vows to take the lives of men and women during their most precious moments--midway through the purchase of an engagement ring, after a meeting with a wedding planner, trying on the perfect gown for a day that will never come. The Promisor arrives silently, armed with kni