6. The Sign of Three

https://youtu.be/N-lMgIg2p1c

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Sherlock puts the best in best man in this episode, which sees him taking a trip down memory lane through some old cases and solving a brand new murder case (before anyone can be killed) while delivering his speech at John and Mary's wedding reception. He also reveals that the pair will soon become a trio because Mary is expecting a baby.

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