Robin Robinson

The thwarted escapees return to their cells undetected, but a CO becomes suspicious about a broken pipe. Veronica and Nick ask a judge to postpone Lincoln's execution, and Sara asks her father, Governor Tancredi, to review Lincoln's case.

Michael, Lincoln and the inmates risk life and limb, the Vice President fears she will lose her command if not her life, and Veronica tracks down the most significant piece of evidence to prove Lincoln's innocence.

Severide and Cruz discover a child's remains in a chimney, and Severide links it back to a case he previously worked on. Also, Firehouse 51 tries to help Casey win as the vote for alderman edges closer.