After piecing together the message the killer was sending using the scrap paper left at each scene, Amelia and Rhyme are led to an old crime novel called "The Bone Collector", where it is revealed the killer is replicating the crimes from the fictional story. This leads them to the killer’s next victims, a grandfather and granddaughter who have been tied to a pier during a rise in tide. The paramedics successfully resuscitate the young girl, but the grandfather is pronounced dead. At the scene, Amelia finds another piece of bone, part of an old police badge, and a subway map. These clues together with the asbestos left by the killer at the scene of Lindsay’s death lead Amelia to an abandoned subway station, where she sees numbers on the side of a carriage that have been tampered with to spell out Rhyme's police badge number.