Max and Caroline approach the owner of the pizza place next door about renting space to expand their renovated dessert bar.
Corrupt cops are targeted when it's suspected they're working with military personnel, and Sam and Callen go undercover as California highway patrol officers to stop the operation.
A homicide occurs at a sci-fi convention, forcing Castle and Beckett to deal with zealous fans and pompous celebrities as they investigate the crime.
Season 5 ends with Max and Caroline learning that Han is in big trouble with a gang for amassing a hefty gambling debt on women's tennis that he can't repay.
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