Insurance mathematician Henri Koskinen has just restored order in his life as well as in the adventure park he now owns, when a man from the past appears - and turns everything upside down again. More problems arise when the park's equipment supplier is taken over by a shady trio: Why won't Suomen Leikki Ltd sell the new Moose Jump to Henri when he needs it for the park's main attraction? At the same time, Henri's relationship with the artist Laura Helanto is reaching a breaking point. To survive, Henri Koskinen has to count with more precision than ever - and to push every calculation to its limits.