One Night (S03E16)

Rush and her colleagues must use their unique expertise and interrogation skills to solve a killer's demented puzzle and save a young boy's life. In the course of one night, the team members are pushed to their wits' ends trying to crack the code and rescue the boy, who has been left to die at an undisclosed location. Ultimately, the answer lies in one man's past - and the only way for Rush and the others to figure it out is to delve deeply into their own pasts. (Warner Bros. UK)