Sneakerhead

The team chases after a pair of rare, and ridiculously expensive, sneakers that just keep disappearing, leaving death and injury in their wake like a curse. Liz weighs her potential promotion against losing the team in the L.A. office.

Trivia

 * The title appears to be a term for an obsessive (and very rich) fan of these sports shoes, who can afford hundreds or even thousands of dollars for a particular pair. It is comparable to "petrolhead" for extreme fans of cars, usually with large and expensive collections thereof.
 * Patrick Bauchau, who played Jean Stephanois, had a similar role on Castle as an elegant Raffles-esque thief.