本集，丁丁又有了新的探险。为了解决人类饥饿问题，卡尔库鲁斯和扎拉梅阿教授研制出了一种可在沙漠生长的蓝橙子。结果被别有用心之人将两人抓走囚禁起来，丁丁和他的伙伴们救出教授了么？他们又会有怎么样的冒险经历呢？

Barcelona, 1967. Hans Fromm, a German-born architect, lives an well-ordered everyday life. He has become the target of an antifascist death squad though. Indeed their leader, Julius, whose brother was killed by Schmidt, a merciless S.S., believes, without being absolutely certain, that Fromm and Schmidt are the same man. The team, whose other members are Georges, the son of a deportee liquidated by Schmidt craving for action, Raphaël, a mercenary type, Nils, the photographer and Romain, watch Fromm's every move until Julius, convinced at last that the quiet German is their man, gives the green light for the operation. They manage to lure the former Nazi to an old house but Schmidt/Fromm won't let himself be captured so easily...