7-year-old Bertil's parents are at work and Bertil are home alone and bored. He is the only child in the family since his sister Martha died of an illness. But everything changes when he meets little Nils Karlsson Pyssling and they become friends. Nisse who lives in the basement in a room he rents from the rat Tjofsan,wich is cruel我们的爱,就像一首悲伤的歌,旋律在耳边回荡,却再也唱不出曾经的甜蜜。