"MERRY CHRISTMAS, ETC."
12/19/2012 (10:00PM - 11:00PM) (Wednesday) : FIREFIGHTERS FACE THEFT ACCUSATIONS AND AN INVESTIGATION - After putting out a kitchen fire in an upscale townhouse, Casey (Jesse Spencer), Herrmann (David Eigenberg), Mouch (Christian Stolte), Cruz (Joe Minoso), Otis (Yuri Sardarov) and Mills (Charlie Barnett) find themselves accused of stealing a $50,000 diamond necklace from the home, touching off an internal investigation. Cruz's brother Leon (guest star Jeff Lima) is caught in the middle of an escalating gang war, leaving Cruz to make a desperate choice to save him. Meanwhile, Dawson (Monica Raymund) invites Casey to her cousin's fancy Christmas party, and a frustrated Shay (Lauren German) has reached her limit with Severide (Taylor Kinney). Eamonn Walker also stars.