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Bea discovers more about her mother's long-ago connection to Sherlock and Watson, while Billy contemplates revenge after a brutal reminder of his past.
Jessie comes face to face with Inspector Lestrade at a crime scene, Bea plays cat and mouse with Watson, and Leo feels torn over his life at the palace.
Bea suspects a spate of stolen body parts links to an old case. Jessie approaches Sherlock about her nightmares. Leo makes a stand for his future.