Mary Elizabeth Burns

Voight and the team delve into a cold case in search of clues to solve a shocking new crime. With its focus on buried memories, the case sparks concern for Burgess and Ruzek about Makayla’s mental healing.

Cookie calls in a favor with mega-superstar Kitty (guest star Mariah Carey) to record a new song with Jamal, hoping he will overcome his inability to perform. Meanwhile, Andre runs into some trouble and things don’t go as planned. Cookie and Lucious are at odds, Hakeem and Gram (guest star Romeo Miller) fight for Tiana’s attention, and things heat up between Cookie and Angelo Dubois.

Lt. Severide (Taylor Kinney) hits the top of the list as Det. Lindsay (guest star Sophia Bush) starts calling in suspects with the clearest motives to make the guy who kidnapped Katie disappear. Meanwhile, Jones (guest star Daisy Betts) is still having trouble fitting in as word of her disruptions reach the fire department's headquarters. Elsewhere, Herrmann (David Eigenberg) celebrates his twentieth anniversary with his wife, but no one supports his idea on the gift he intends to give.