#25: Double Trouble launches the next three-book arc storyline, featuring a teen celebrity being stalked, with a twin brother who adds some interesting complications into the mix.

ATAC Briefing for Agents Frank and Joe Hardy MISSION: Continue working undercover as part of teen movie start Justin Carraway's entourage to find out more about the unsolved murder of the celeb's least favorite paparazzo and other mysterious happenings. LOCATIONA: Atlantic City, NJ. POTENTIAL VICTIMS: One murder has already taken place. If the suspect isn't caught soon, anyone could be the killer's next victim. SUSPECTS: Everyone seems to go crazy when it comes to teen screen superstars - but now there really is a crazy person running around...and he or she may be closer than anyone thinks!

ATAC Briefing for Agents Frank and Joe Hardy MISSION: To located Ryan Carraway, who has mysteriously gone missing while his movie star brother, Justin, was filming on location in Bayport. And to find out what, if anything, Justin is hiding. LOCATION: New York City. POTENTIAL VICTIMS: Ryan - and anyone who comes too close to finding out who was involved in his vanishing act. SUSPECTS: Movie star Justin has been acting stranger and stranger, and now there's evidence that points to the fact that he might be involved in his own brother's disappearance...