In the middle of the summer holidays, the body of a drowned man with ligature marks on his wrists is recovered from Tammerkoski river. The investigation by Koskinen's team is further strained by the hit-and-run case of a dubious music manager and the mysterious Carl Friedrich. When a new body is found in Lake Näsijärvi, the connection between the victims is made clear.

Kerttu is assigned to a gym due to back problems, where it turns out she is a genetic super-talent. Suddenly, she finds herself aiming for an incredible goal: a fitness championship. She is aided by a former genetic prodigy, journeyman bodybuilder Vili, who has lost his purpose in life. The mismatched duo have a lot to learn from each other. Before Kerttu can get into shape for the competition and Vili back on the road to life, both must grow as people and overcome steep prejudices.

Johanna, the hostess of the parish house, does her utmost to ensure that everything goes according to plan. There is no room for error. The last thing Johanna needs is a busload of uninvited guests knocking on the door of the parish house on the eve of an important wedding. However, a passing Russian party has had its car broken down and Johanna soon finds herself accommodating the party at the parish house. Johanna's brother is tasked with fixing the car to get the guests on the road and out of the way quickly. Her brother's entrepreneurial friend, on the other hand, sees great opportunities in the situation and decides to act. The clock ticks, the car won't start, the wedding ceremony is about to begin and the recipe for disaster is in motion.