The series three conclusion of Sherlock was full of surprises, with fans of the reclusive super sleuth, played by Benedict Cumberbatch, even treated to a bit of romance.
His Last Vow aired in the UK last month, and aside from the return of Moriarty and the secret identity of Mrs John Watson, viewers also saw Sherlock proposing to pretty bridesmaid from episode two, Janine.
Just when we thought the confirmed bachelor had gone and got himself a girl it turned out it was all a ruse to get close to new super villain Magnussen.
In a behind the scenes interview with Benedict and show creators Steven Moffat and Mark Gatiss on the soon to be released DVD of the series, the trio explain the the decision to have Sherlock break a woman's heart.
Martin Freeman and Benedict Cumberbatch as Watson and Sherlock (BBC Pictures)
"In the original story, he does become engaged to Milverton's maid," MTV News report Gatiss as explaining on the DVD. "Heartlessly, which is what Steven has extrapolated into this thing."
Gatiss and Moffat go on to laugh about how Watson's (Martin Freeman) reaction to Sherlock was spot on: "But you're behaving like a human being here!" Gatiss says, laughing. "You think it's nice, he's become humanised," Moffat continues. "He knows how to do all that, but he exploits it to terrible ends."
"It's devastatingly cruel, what he does," Cumberbatch chimes in. "He inveigles his way back into her life and impresses her, and turns his ability on to a single focus."
Benedict has been speaking out on Sherlock's love life (WENN)
At a Q&A ahead of the last episode last month, Moffat explained that such scenes, along with glimpses of the detective's parents, were all about humanising the character:
"The frightening thing about Sherlock Holmes is that he has all the impulses that other human beings have, he just suppresses them in order to be a better detective and it's in those moments that he doesn't successfully suppress it that he gets into trouble.
"He believes that emotion gets in the way of his brilliant brain. On the evidence of the show so far and on the original stories, he's completely right. When he gets emotional, he gets blinded, he doesn't stop Mary as a fraud like he should have had, as she points out in the episode, ages ago."