Season 2 Episode 16
"The One Percent Solution"
Tensions rise when Holmes and Watson are forced to partner with Gareth Lestrade, Sherlock’s former Scotland Yard colleague...
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Sherlock and Joan are called to investigate a bombing at a restaurant that targeted finance executives and government officials.
On the case, they are reunited and forced to work with Gareth Lestrade, who is now consulting for one of the CEOs involved in the case.
Sherlock, Watson, and Lestrade go to the hospital, where they talk to a woman who was sitting at the table where the bomb was placed under. Lestrade takes over the questioning, which gets under Sherlock's skin.
Videotape from the hotel attached to the restaurant leads Sherlock and Joan to suspect that Lestrade is covering up his boss's involvement.
We learn that the CEO is being targeted by a blackmailer who was one of many to whom he offered indecent proposals in the past and that Lestrade has been helping him make the offers.
The CEO is forced to reveal his involvement in order to catch the blackmailing bomber.
The killer wound up being the woman who sat at the table.
Lestrade loses his job and comes to stay with Sherlock and Joan.