Blindspot: The Big Mayfair Twist We Didn't See Coming

The rest of the episode revolves around an art heist, with Rich Dotcom, after getting beaten up in prison, promising Jane and Weller that he can lead them to one of the FBI's most wanted terrorists.

Dotcom's elaborate plan involves the team dodging a series of seemingly impossible security measures the perpetrator of the original heist (an art enthusiast-slash-professor) has put in place to protect the paintings, and later Dotcom himself escorting Jane to a party to deliver the paintings.

The paintings he and Jane deliver to the supposed "terrorist" are actually all fakes, duplicated from the originals by the art restorer the FBI brings in to repair one of the paintings that was damaged as they lifted it from the professor's house.

After making it look like he's about to commit suicide (a recurring theme in this episode!), Dotcom actually parachutes off the roof of the house where the party's being held and onto the ground, where he meets the art restorer - his ex - and they drive off happily ever after, the original paintings safely stored in the backseat.

[...] what's the first thing Weller does after hearing this?