Diana, the character Thomason plays, is an FBI agent with quite a fascinating background as viewers find out this week. She's the daughter of diplomats, although it's not revealed for which country. She, more than anyone else, knows what it's like to lose someone close. Reaching out to Neal after Kate's passing is a natural move, and the resulting conversation only strengthens their bond.
Peter and Mozzie (Willie Garson) are forced to team up when quick cash is needed to help the scam along. Mozzie goes disguised as a waiter to take the surplus to Neal and Diana. It is pure Garson, which means pure fun.
The story of the music box is set aside more or less this week to focus on who Agent Fowler, the OPR dude who wreaked havoc last season and nearly cost Peter his job, was about to meet. Peter and Diana have a photograph, but not a name.They understand this is a guy with some sort of specialized training. Neal suspects both FBI agents are interested in finding out who's behind the plane hangar incident ("Out of the Box"), but doesn't know they have a picture.