Jessica Morgan is a gifted profiler. Some might even use the term legendary when speaking of her skills. So much so that the FBI Director takes it upon himself to call her back into service years after a personal tragedy caused her to walk away from the Bureau. Returning with her profiling skills intact and a medical degree, Agent Morgan's task is to assess the investigation she's assigned, profile the UNSUB (unknown subject), and deliver the profile to the investigating agents before moving on to the next case. She works tirelessly, relentlessly, and most importantly...alone.

Until now.

The Director pairs Jessica with Dr. Erin Little, a skilled forensic pathologist and an outstanding FBI agent. Erin has earned a favorable reputation during her ten years at the Bureau. Erin's task force, assigned to find a serial killer dubbed The Slasher by the newspapers, continues to hit dead ends, prompting the Director to ignore Jessica's rule of working alone. He puts them together, knowing their combined skills are needed to catch The Slasher and bring him to justice. As sparks fly professionally and personally, Jessica and Erin race against time to stop the serial killer before he strikes again.