"Down the Rabbit Hole" -- When serial killer Thomas Wilder (Louis Cancelmi) attaches a message to his latest victim that taunts Danny, their deadly game of cat and mouse becomes personal for Danny, on BLUE BLOODS, Friday, April 15 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Pictured: Bridget Moynahan as Erin Reagan. Photo: Craig Blankenhorn/CBS ÃÂ©2015 CBS Broadcasting, Inc. All Rights Reserved | Episode 6.20 - Down the Rabbit Hole | Promotional Episode Photos | Season 6 | blue-bloods | Gallery

SpoilerTV Image Archive | Gallery | blue-bloods | Season 6 | Promotional Episode Photos | Episode 6.20 - Down the Rabbit Hole | "Down the Rabbit Hole" -- When serial killer Thomas Wilder (Louis Cancelmi) attaches a message to his latest victim that taunts Danny, their deadly game of cat and mouse becomes personal for Danny, on BLUE BLOODS, Friday, April 15 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Pictured: Bridget Moynahan as Erin Reagan. Photo: Craig Blankenhorn/CBS ÃÂ©2015 CBS Broadcasting, Inc. All Rights Reserved

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