Castle: los primeros besos

CASTLE - "Knockdown" - Old wounds are reopened when the retired lead detective on Beckett's mother's homicide case contacts her with new information, but then is gunned down right in front of Beckett before he can tell her what he knows. The investigation into his death leads back to a decades-old conspiracy that may hold the answer to who was behind Beckett's mother murder and why. With the stakes and emotions running high, Castle and Beckett take their partnership to the next level, on "Castle," MONDAY, JANUARY 24 (10:01-11:00 p.m. ET). Max Martini guest stars. (ABC/ADAM TAYLOR) NATHAN FILLION, STANA KATIC

CASTLE - "Knockdown" - Old wounds are reopened when the retired lead detective on Beckett's mother's homicide case contacts her with new information, but then is gunned down right in front of Beckett before he can tell her what he knows. The investigation into his death leads back to a decades-old conspiracy that may hold the answer to who was behind Beckett's mother murder and why. With the stakes and emotions running high, Castle and Beckett take their partnership to the next level, on "Castle," MONDAY, JANUARY 24 (10:01-11:00 p.m. ET). Max Martini guest stars. (ABC/ADAM TAYLOR) NATHAN FILLION, STANA KATIC

CASTLE - "The Blue Butterfly" - When Castle and Beckett investigate the killing of a treasure hunter, they discover the case is linked to a mysterious homicide from 1947 involving a hard-boiled private detective. Castle realizes the only way to solve the present-day murder is to solve the murder from the past. The 1947 case comes to life through stylized flashbacks, featuring Castle as the private eye and Beckett as a femme fatale, on "Castle," MONDAY, FEBRUARY 6 (10:01-11:00 p.m., ET), on the ABC Television Network. (ABC/KAREN NEAL) NATHAN FILLION, STANA KATIC