《鼠洞中的温暖友谊》谍影重重之上海

　　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.