Plot summary
Neal and Peter must go undercover into the world of corporate espionage after a tech company's head researcher is murdered. Mozzie and Diana are put together to look over Kate's murder, and Mozzie realizes that Diana has the music box and Peter knows where it is. Peter then shows the music box to Neal, and Neal reveals the key Alex gave him. Neal tells Peter, "No more secrets", before opening the box.
Credits
Adapted from Wikipedia contributors, List of White Collar episodes. HTML formatting and reference markers removed.