WARNING: Side effects may include the ability to catch a killer... FBI Agent Maggie Allen had a gift for catching serial killers. Now, following the death of her husband and son, she can barely get out of bed. Desperate, Maggie agrees to take part in a drug trial—a last-ditch effort to find something that might help her cope. The drug helps. However, it also carries several unpleasant side effects, not the least of them being an exceptional heightening of all her senses...just the kind of thing her old partner could use to help the FBI track down a prolific serial killer who is proving impossible to catch.