Some say Maggie O'Dell has lost her edge as one of the FBI's best profilers. Since capturing Stucky, she has been walking a tightwire, battling nightmares and guilt over the victims she couldn't save. Now that Stucky is loose again, she's been pulled out of the field. But as Stucky's trail of victims leads closer and closer to Maggie, she is put back on the case under the supervision of Special Agent R. J. Tully. Together they race against the clock to hunt the killer, and Maggie finds herself pushed to the very edge. Has her desire to stop Albert Stucky become a matter of personal vengeance? Has she crossed the line? And has that been Stucky's goal all along—to make her into a monster?