The excursion tells the story of a pair of birds living on an island in the middle of the sea. Their square house, their barely used boat, and their dock are the focal points of their world. Until they discover a red bottle in the surf, and nothing is the same as before. Bachwald narrates an exciting comic adventure in wordless sequences and colorful image series that give space to the setting, the sea, and the atmosphere. And "Message in a Bottle" is just the beginning of a journey that will take the two birds across the vast sea to new islands and adventures.