The little spider Wederlich is full of excitement because she is going on vacation by the sea with her grandma Erna. There, she meets Mats, the sailor spider, and together they explore the beach, the mudflats, and the sea. The little spider is amazed by the salty water, the ebb and flow, and meets many new animals: lugworms, seagulls, crabs, and seals. She even finds a message in a bottle with a riddle. There is so much exciting stuff to discover here!.