To solve the most twisted crimes, the FBI's Behavioural Analysis Unit (BAU) explores the darkest places - inside the depths of Criminal Minds. And in the 23 episodes of Series 10, the cases cut dangerously close to home. Seasoned undercover FBI Agent Kate Callahan (Jennifer Love Hewitt) joins the elite team led by Supervisory Special Agent Aaron Hotchner (Thomas Gibson) as they pursue a serial killer who hacks his victims beyond all recognition. Experienced profiler David Rossi (Joe Mantegna) is dogged by a mysterious woman from his past, while Dr. Spencer Reid (Matthew Gray Gubler) grapples with the death of a mentor. Derek Morgan (Shemar Moore) and Jennifer "JJ" Jareau (A.J. Cook) take on cases that evoke grim memories from their personal histories, while technical analyst Penelope Garcia (Kirsten Vangsness) heads to death row to confront a perp from her past. Regardless of the risks, the brilliant thinkers of the BAU fearlessly uncover the darkest secrets in order to unlock the most unpredictable solutions.