In 1994, the Swedish engineer, entrepreneur and adventurer Malte Stierngranat was buried in a pyramid that he had designed himself. Carol is contacted by the cleaner George in the middle of a cold Swedish winter. This leads her on a journey in which she has to delve into Malte Stierngranat's illustrious life and his legacy. George is the cleaner and caretaker of Malte Stierngranat's son, Erik, and his family. The entire family, which is one of the wealthiest in the city, has gone missing.