Number one bestselling author and ultimate thriller writer Jeffery Deaver returns with a new Lincoln Rhyme investigation Rhyme and Amelia Sachs' latest case: catching a terrifying killer targeting couples The happiest time of their lives - will be their last William and Anna went to collect her engagement ring 15 carat, almost flawless But the Promisor had other ideas for their future Their murder - and that of the diamond cutter they were visiting - is only the first of a series of macabre attacks Someone is targeting couples just as they start their lives together Lincoln Rhyme and Amelia Sachs, newly married themselves, are on the hunt But the killer is hunting down any witnesses who can help them He has promised one thing: to destroy Rhyme and Sachs will have to use all their own skills and determination to break his vow