While solving cases Castle and Beckett encounter a vigilante who starts catching the murderers for the NYPD. Beckett and the rest of the crew are very hostile to the idea of vigilantism to the displease of Castle. This is the onset of a long vigilante hunt. Even though at first this excites Castle, the findings later on reveal some really grave news for him as the vigilante hunt becomes personal.

’Well, I kinda need you to go on a date with this person I met online.’’ "WHAT?" ________________________________________________________ Meet Diamond King. Weird name with a weird personality. She's a girl who likes to stay in her bedroom, surrounded by your typical romance, fantasy novels. ________________________________________________________ But what would happen if her best friend asks her for a favour? Would she deny it or would she agree to it? Would thousand problems and thousand feelings occur by helping her best friend? ________________________________________________________ You'll have to read to find out.