Returning to New York City from their honeymoon to learn that a serial killer has been targeting couples in the process of buying engagement rings, Lincoln Rhyme and Amelia Sachs discover that their target has a larger agenda than originally realized and that there is something unusual about the ring that Rhyme gave Sachs.
Engagement rings -- Fiction.
Murder -- Investigation -- Fiction.
Police -- New York (State) -- New York -- Fiction.
Rhyme, Lincoln (Fictitious character) -- Fiction.
Detective and mystery fiction.