Berlin Syndrome

Clare (Teresa Palmer), a young Australian tourist, is backpacking around Germany, taking photographs of architecture and exploring shops. In Berlin, she meets a local man named Andi (Max Riemelt) and has a one-night stand with him. The next morning, however, she finds that he has locked her in his apartment. She believes him when he says he accidentally forgot to leave her a key, and she stays with him another night. Soon, however, Clare realizes Andi has no intention of ever letting her go, and that he has written the word meine (mine) on her shoulder and stolen her SIM card from her phone. She tries to escape by smashing the windows but discovers they are double paned. To her amazement, when Andi comes home, he acts like nothing is wrong, offering her flowers and pesto. She screams and attacks him but he physically restrains her, then keeps her tied up. Read more on Wikipedia.