Sherlock is in disgrace after Reichenbach, and Molly is in danger. The only solution he can see, the only road out, is to marry Molly and flee out of London. But it's all part of the cover- Sherlock doesn't really love Molly, he's just protecting her. She's just dragging him down. Soon, Molly is expecting a baby, but she's not happy, and neither is Sherlock.
Can Molly make Sherlock happy and fall in love with him all over again?
And, this time, will Sherlock ever love her back?