At the Märkisches Museum, Undine shows visitors the urban development of Berlin, a city built on a swamp. The presentation is timely and graceful, yet inside, Undine is burning, because Johannes, the man she is in love with, is about to leave her. And if that happens, she will have to kill him. When Johannes does indeed leave her, fate seems to be fulfilled, but an unexpected encounter with Christoph, a diver, changes everything.
