Castle Spoiler: Does Detective Ryan Have Ties to the Irish Mob?

In an earlier Castle spoiler, we told you that squeaky-clean Detective Ryan is getting an episode that’ll explore his past. Now, TVLine has exclusively learned who’s going to be playing this "blast from the past," and you won’t believe who it is! None other than Mad Men’s Cara Buono will guest star as Siobhan O’Doul, a Staten Island tavern owner with ties to the Irish mob and Ryan! According to TVLine, when the detectives investigate a murder case...


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