Based on the novel by Melanie Joosten, Berlin Syndrome follows Clare (Teresa Palmer), a carefree Australian backpacker who arrives in the titular German city ready to explore and meet some new people. She hooks up with a local guy named Andi (Max Riemelt) and spends the night at his apartment. But when she wakes up, she realizes that her nomadic adventures aren't going to continue as planned, as Andi has her locked in, and he's taken her SIM card. 

Clare's escape attempts prove ineffective, and as she spends more time with Andi, she discovers that she's not the first woman he's held hostage. However, if she manages to get out of his clutches, she might be the first to survive. Suspense builds throughout the film as the audience becomes increasingly invested in Clare's fate. She's not going to get out of this prison in a day or two — if she wants to make it out alive, she has to play the long game. One of the most tense and terrifying films on Netflix, Berlin Syndrome is the kind of thriller that reminds us why our parents warned us not to talk to strangers.