Undine is a historian and tour guide at the Berlin City Museum specializing in urban development, while Christoph is an industrial diver. Linked by a love of the water, the two form an intense bond, which can only do so much to help Undine overcome the considerable baggage of her former affair.

Undine is a historian and tour guide at the Berlin City Museum specializing in urban development, while Christoph is an industrial diver. Linked by a love of the water, the two form an intense bond, which can only do so much to help Undine overcome the considerable baggage of her former affair.