Svante is a young boy who lives with his family in a Stockholm apartment. One day he meets Karlsson, a chubby little man in the prime of his life, who can fly using a propeller on his back and who lives in his little house on the roof.
Gösta Eriksson, a hairdresser, buys a car from used-car dealer Bertil Planåker. But Gösta soon discovers that the car is a wreck. Planåker won't give him his money back, in fact he denies ever having seen Gösta. Gösta's brother Rolle is released from prison and promises to help him. They form an investment company, Parabola, and convinces Planåker to invest a lot of money in it. Planåker has a lot of shady business colleagues who also invest their money. Gösta's and Rolle's scam becomes much bigger than they had bargained for.
Harry Lund is having a bad day. First he gets fired. And then loses his entire fortune at an illegal gambling club. On his way out, he is assaulted and drugged by unknown men, and wakes up in a car with another man. A very dead man. A very murdered man. And Harry's penknife sticks out of his body. Harry flees in panic to Stockholm. And now not only the bad guys are close on his heels - but also the police...
