THE PROMISE is an intense, fast-paced and gripping Scandinavian thriller told in four parts. In Herstedvester Prison sits a frustrated and restless Nina with her young protégée, Gabriela. They're both on the run from an ominous dark past that's constantly on their heels. When Nina is released on parole, she has difficulty enjoying her newfound freedom. Firstly, because she has to leave the defenseless Gabriela in prison, and secondly, because Nina's new legal guardian definitely isn't to her liking ...