Sean Graham

It's Christmas time and both Marshall and Robin are feeling homesick in New York, and Ted's immature younger sister Heather arrives in the city. Ted has been trying to keep Heather and Barney apart because he fears they will sleep together. Barney and Heather prove Ted wrong and Ted is forced to admit that his sister has grown up.

Monroe is in a tough battle to convince his parents to accept his life choices. Meanwhile, Nick asks Juliette for help to help him understand the Wesen aspect of his cop-killing scalper investigation.

Nancy is ready to give birth and marry Esteban until she discovers a secret; Silas and Doug's dispensary is in full swing; Celia hates her job; Andy goes on a spending spree.

Frank asks Will to help deal with extremists threatening to murder hostages. Hammerschmidt digs deeper into the allegations against Frank.

As the hostage situation continues, Claire secretly negotiates with Yusuf al Ahmadi. Frank confronts Hammerschmidt.