While Teresa and Jarek set the stage for their case against Alderman Gibbons, their effort to clean up Chicago takes an unexpected turn when a deadlocked jury acquits a corrupt city official. Suspicious, the two mount an investigation, only to discover that jury tampering is just the tip of the iceberg.

The case against Alderman Gibbons escalates, and Teresa, Jarek and Caleb scramble to locate a star witness. As undercover cop Liam Hennessey continues to assemble evidence, he's forced to take matters into his own hands.