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 of the series, you discover he renounces Nazism and flees to Switzerland.) One, Erwin, resists Nazification. (In a later book, his father takes him to Sweden. He eventually, however, fights for the British.) And the girl, Miriam, who is Jewish, immigrates 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 once again.)