After his parents' death, construction worker Sigi doesn't know what to do with his life. He can't do much with his pay, and as a working-class man, women aren't interested in him. But things start to change after a colleague advises him to start moonlighting as a private builder and he meets the beautiful Hannah.
Zurich-born Hugo Koblet was the first international cycling star of the post-war period. He was a stylist on the bicycle and in life, and a huge heartthrob. Koblet had a meteoric rise and won the Giro d'Italia in 1950. Once he had reached the zenith of his career, Koblet was put under pressure by overly ambitious officials and ended up ruining his health with drugs. In 1954, he married a well-known model and they became a celebrity dream couple. After his athletic career ended, Koblet began to lose his footing. Threatened by bankruptcy, he crashed his Alfa into a tree.
Narcotics investigator Herbert Strähl is engaging in a fierce and seemingly hopeless battle against the drug scene on Langstrasse in Zurich. Carol is a wild young drug addict. Strähl's problems really begin when he falls in love with her. In his attempt to get Carol out of her disastrous environment, he increasingly finds himself in danger of falling into a vortex of dependence and violence.