Crime, love and Finland's biggest deer. Does math survive everything?

Actuary Henri Koskinen has just gotten his life and adventure park on track when a man from the past shuffles the pack. More problems are caused by the transfer of a company supplying park equipment into the hands of a twilight trio: why does Suomen Leikki Oy not agree to sell the new Hirvihyppy device as the attraction of the park?
At the same time, Henri's relationship with the painter Laura Helanto is at a dead end. In order to survive, Henri Koskinen has to calculate more accurately than ever before - and stretch every formula to the extreme.