Sherlock investigates a double homicide which mirrors a case from 13 years ago, while Watson discovers what happened to Sherlock in rehab.
Nichols and Eames investigate the suspicious death of a young drug addict who was on the road to recovery; Wheeler goes into labour.
Logan and Wheeler investigate when a former teen star, affectionately remembered for portraying a geeky TV character, is found buried in a potter's field. The detectives' enquiries soon lead them to bootleg DVDs and the Albanian mob.
Coulson and the team find themselves involved in a cat-and-mouse game in order to save Director Mace.
The death of a rock singer isn't an overdose as first suspected but the investigation is complicated by a writer, who was formerly a police officer.