Jeff returns to Greendale to help his former law partner gather evidence for a lawsuit; thinking Jeff is planning to help save the school, Dean Pelton calls the study group back together.

Two years after the devastating events of The Reichenbach Fall, Dr. John Watson has got on with his life. New horizons, romance and a comforting domestic future beckon. But with London under threat of a huge terrorist attack, Sherlock Holmes is about to rise from the grave with all the theatricality that comes so naturally to him. It’s what his best friend wanted more than anything, but for John Watson it might well be a case of ‘be careful what you wish for!’ If Sherlock thinks everything will be just as he left it, though, he is in for a very big surprise…

Peter’s thrown back into an unsolved larceny case that has Neal worried – because Neal’s the one who committed the crime.

The gang encounters a guy at the wedding who intentionally stirs up trouble among them, and Marshall finally arrives at the Farhampton Inn.

Security forces close in on Carrie and Brody. As Saul plans a last ditch rescue operation, Brody struggles to find redemption.

When a hedge fund manager who was also running a Ponzi scheme is murdered, Holmes and Watson must determine which of his clients is guilty. Also, Sherlock contemplates sponsoring a fellow recovering addict.

Neal and Peter take on an unprecedented asset recovery case for the Museum of Natural History: a stolen Tyrannosaurus Rex skeleton and its egg.

Now that the truth is out there, things will never be the same and everyone will have to face the consequences of their actions.

Jay and Manny set out to cut down their own Christmas tree; Gloria is on edge when her mother visits; Mitchell does last-minute shopping to find the perfect gift for Lily.

Axl wants to spend time with his friends when he comes home for Christmas; Sue’s allergies threaten to ruin her holiday; Brick’s lie is uncovered.