Eight lonely people take part in the project “Find Your Other Half” on one of the Valaam islands. However, instead of a love that lasts forever, two of them meet death. What happened on that distant island in Lake Ladoga? And what secrets are hidden by those who remain alive? A detective must unravel the mysterious crime, and the heroes must answer the question: what are they ready to do to remove obstacles on the road to happiness? A sealed, airtight detective story against the backdrop of Karelian landscapes—combining a gripping investigation with a conversation about the nature of loneliness among thirty-year-olds.