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'Sherlock' season 3 finale sneak peek: John's shocked Sherlock has a girlfriend

"Sherlock" season 3 ends on Masterpiece Mystery with episode 3, "His Last Vow," for which PBS released a new sneak preview on Wednesday, Jan. 29.

Lars Mikkelsen as Charles Augustus Magnussen
Lars Mikkelsen as Charles Augustus Magnussen
Courtesy of (C)Robert Viglasky/Hartswood Films for MASTERPIECE
Martin Freeman as Dr. John Watson in 'Sherlock' season 3 "His Last Vow"
Courtesy of (C)Ollie Upton/Hartswood Films for MASTERPIECE

In this next "Sherlock" episode, a case of stolen letters leads Sherlock Holmes (Benedict Cumberbatch) into a long conflict with Charles Augustus Magnussen (Lars Mikkelsen), the Napoleon of blackmail, and the one man he truly hates. How do you tackle a foe who knows the personal weakness of every person of importance in the Western world?

The "His Last Vow" sneak peek offers a look at John finding out that Sherlock has a girlfriend (Janine), but Sherlock would much rather talk about Magnussen, whom he describes "like a shark." "I've dealt with murderers, psychopaths, terrorist, serial killers. None of them can turn my stomach like Charles Augustus Magnussen," Sherlock explains, but John would much rather talk about the fact that Sherlock is in a relationship. Plus, don't forget to check out the promotional photos PBS has released from the season 3 finale in the slideshow.

"Sherlock" season 3 airs Sundays at 9:58 p.m. on PBS. What do you think of this episode 3 "His Last Vow" clip?

© Meredith Jacobs 2013

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