Anna (Noomi Rapace, GIRL WITH THE DRAGON TATTOO, PROMETHEUS) is a woman on the run with her eight year old son. Fleeing from her violent ex-husband they are given a safe house in a stark apartment block. Terrified he will find them, Anna buys a baby monitor to keep her son safe while he sleeps. But strange noises start to echo from inside the building, another child is in danger and when her son makes a mysterious friend, Anna will no longer know what she can trust or what is imagined or real.
