The "Our Gang" type adventures of German working class kids from a Berlin apartment building (number 67) during the early 1930s. With Nazism's rise, however, their tight-knit group unravels. One leader, Paul, becomes a Nazi. In a later book in the series, he renounces Nazism and flees to Switzerland. Another, Erwin, resists Nazification. In a later book, his father takes him to Sweden and he eventually ends up fighting for the British. The girl, Miriam, who is Jewish, emigrates to Canada. In a later book, she returns to Europe after the war, where all three comrades finally meet in Geneva to renew their vows of friendship.