Kidnapped by lightning

The close-knit six-member Gang of the Brave is about to spend a few days at the Klein siblings' cottage. No mysteries, no danger. The only one missing is Beta, who has gone on a language course in Portugal. But Tim wouldn't survive by the river without his forgotten fishing rod, so he and Alpha head back home. A storm rages, lightning zigzags across the sky, rain lashes the powerless cottage, the rest of the group's phones aren't working, and Tim and Alpha haven't returned…