SPOILER TV have the PRESS RELEASE up
Under Fire" - When Castle and Beckett discover that the victim of a building fire was actually shot to death, they get on the trail of a serial arsonist turned murderer. Meanwhile, Ryan's wife, Jenny, goes into labor, but disaster threatens to ruin the joyous moment, on "Castle," MONDAY, JANUARY 6 (10:01-11:00 p.m., ET) on the ABC Television Network.
"Castle" stars Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett, Susan Sullivan as Martha Rodgers, Molly Quinn as Alexis Castle, Penny Johnson Jerald as NYPD Captain Victoria Gates, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, and Seamus Dever as NYPD Detective Kevin Ryan.
Guest Cast: Juliana Dever as Jenny, Wendy Davis as Delia, Nic Bishop as Fire Chief Miller.
"Under Fire" was written by Andrew W. Marlowe & David Amann and directed by Paul Holahan.
Taken from: http://www.spoilertv.com/2013/12/castle-episode-611-under-fire-press.html?m=1