Danny looks into the disappearance of a former NYPD officer. Frank must deal with a co-worker who does not want to retire.
Michael prompts a cellblock lockdown which leads to a full-scale riot.
As the riot escalates, Michael risks everything to rescue Sara; the assassin tries to kill Lincoln; Veronica and Nick fly to Washington to trace the tipster's phone call.
Emmy-winning Edie Falco returns as drug-addicted nurse Jackie in the fourth series of the comedy drama.
Things get even more personal for Jack when he learns of a devastating development. Meanwhile, trouble looms for President Taylor and her landmark peace agreement.