1950s Madrid: Montse, an agoraphobic woman, prefers to stay inside her apartment all the time. Her solitude is disturbed when she is forced to shelter their neighbor who injures himself and crawls up to her door.

Spain, 1950s. Montse's agoraphobia keeps her locked in a sinister apartment in Madrid and her only link to reality is the little sister she lost her youth raising. But one day, a reckless young neighbor, Carlos, falls down the stairwell and drags himself to their door. Someone has entered the shrew's nest... perhaps he'll never leave.