The Promise is an adaptation of the New York Times Best Illustrated Book of the Year by Nicola Davies and Laura Carlin. A thief tries to snatch an old woman's bag but she cannot have it without giving something in return.

After failing to apprehend the terrorist behind a Paris attack that claimed dozens of lives, CIA agent Alice Racine is forced to live in London as a caseworker. Her mentor unexpectedly calls her back into action when the CIA discovers that another attack is imminent. Alice soon learns that the classified information she's uncovered has been compromised...

From the cells in the basement to the judge's chambers, Lawless offers a backstage pass to the inner workings of a modern court. Suranne Jones stars as a brand new judge battling to keep her head above the water in the murky depths of the justice system.