The Summer Cottage novel is a realistic fiction with features of a psychological thriller. As a genre, it represents Family Drama. The story is about the relationships and inheritance disputes of late-middle-aged siblings.

The story is set in Ristiina, Finland, on the shores of Lake Saimaa in a summer cottage during a July weekend in 2018. The relationships between the four late middle-aged siblings have escalated into an inheritance dispute and, with it, a 12-year gap. Before that, the development of sibling relationships over the decades has been influenced by many significant events that advancing in flashbacks.
After a fight about their inheritance twelve years prior, the youngest of four middle-aged siblings invites her three older siblings to a meeting at their summer cottage where they once shared cherished childhood and youth memories. A well-planned meeting is arranged to try to rectify the break-up. The siblings arrive with the goal of finally dividing their inheritance and restoring their once-close bonds, but the reunion does not go as planned; painful truths are unearthed, and the family's myriad hidden secrets are revealed one by one. The meeting has a price, and it's not in line with anyone's expectations.