On a freezing December night, with a full moon hovering in the black skies over New York City, two people are brutally murdered - their prolonged deaths marked by eerie calling cards: moon-faced clocks ticking away the victims' last minutes on earth. Lincoln Rhyme and his team have only hours to stop the icy-cold, brilliant Watchmaker, whose obsession with time drives him to plan his carnage with the precision of a fine timepiece.
Amelia is not only Lincoln's eyes and ears on the Watchmaker investigation. She's now lead detective on her own first homicide - a case that sets into motion clockwork gears of its own.
A case with consequences which will endanger many lives, as well as Lincoln and Amelia's future together.