The prime suspect is a strange teenaged truant known as the Insect Boy, so nicknamed for his disturbing obsession with bugs. Rhyme agrees to find the boy while awaiting his operation. Rhyme's unsurpassed analytical skills and stellar forensic experience, combined with Sachs's exceptional detective legwork, soon snare the perp. But even Rhyme can't anticipate that Sachs will disagree with his crime analysis and that her vehemence will put her in the swampland, harboring the very suspect whom Rhyme considers a ruthless killer. So ensues Rhyme's greatest challenge -- facing the criminalist whom he has taught everything he knows in a battle of wits, forensics, and intuition. And in this adversary, Rhyme also faces his best friend and soul mate.