

Ajay reveals that while being tortured in Tbilisi, he heard words "Ammo" and "the English woman", which Ajay assumed to be Mary. Ajay arrives and attempts to kill all three. Mary travels across the world following a random path, but, having planted a tracking device in the memory stick, Sherlock and John follow her to Morocco. Sherlock tries to stop Mary from going after Ajay, but Mary drugs him and escapes.
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Six years prior, a rescue mission of hostages at the British embassy in Tbilisi went wrong, when a coup d'état (set off by a code word "Ammo") killed everyone except Ajay ( Sacha Dhawan) and Mary. Each had a memory stick containing their confidential material, lest anyone be betrayed by another. Questioned by Sherlock, Mary relates her past as a freelance agent on a team called 'A.G.R.A.'. In the center of the last bust is a memory stick.

Hunting the last, Sherlock encounters a culprit.
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Lestrade reveals to Sherlock that four other busts made in the series are smashed. Sherlock notes a missing bust of Margaret Thatcher at the victim's home, finding that it was stolen and smashed upon the front porch. Sherlock quickly solves the case, and reveals that the son was hiding in the car, planning to surprise his father, but died from a seizure. The son is found dead in a car crash, despite having been on a gap year in Tibet. One case involves the son of the Conservative cabinet minister Charlie Welsborough. Mycroft and Scotland Yard detectives including Greg Lestrade ( Rupert Graves) bring Sherlock various cases, hoping it will reveal Moriarty's scheme. It is hinted to be an affair, but John texts the woman to say that it's over. John ( Martin Freeman) befriends a woman he met on a bus. Mary Watson ( Amanda Abbington) gives birth to a daughter, who is named Rosamund Mary. Sherlock is freed, and resolves to wait for Moriarty's ( Andrew Scott) posthumous revenge. Sherlock ( Benedict Cumberbatch) and a committee chaired by Lady Smallwood are attending. Mycroft ( Mark Gatiss) presents doctored footage of Charles Augustus Magnussen's death (" His Last Vow") being shot, so that it appears to the public as though Magnussen was shot accidentally by a sniper.
