Tiffani Theissen, Matt Bomer

Worlds are about to collide on White Collar.

On Thursday's episode (9/8c, USA), the son of an extremely wealthy family shows up on his parents' doorstep 15 years after he ran away from boarding school and, after an international manhunt, was assumed dead. The twist? Elizabeth (Tiffani Thiessen) used to tutor the boy before he vanished at the age of 14.

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"I fell in love with ... Europe. We were going to museums in every city. It was one of the best tutoring jobs I ever had," she says in this exclusive sneak peek.

So what is Neal (Matt Bomer) and Peter's (Tim DeKay) interest in the case? Find out in the exclusive video below:

White Collar airs Thursdays at 9/8c on USA.