Tessa, in Zurich for a plastics conference and to see Ana, a very close friend from schooldays. She becomes involved in a hunt for Ana's boyfriend, Hans, a toymaker who has made two dolls for Ana using a revolutionary new plastic. She meets Ralph, co-owner of a plastics firm. He is interested in the new plastic but his partner. Eric Weber, goes further, kidnaping Hans and stealing one of the dolls to learn the secret of the plastic. The hunt for Hans and to stop Weber stealing the plastic formula involves a disasterous fall into the river Limmat, going to a research centre at the top of the Jungfraujoch mountain, a breathtaking ski down the mountain, and a finale where Ana is captured by Weber only to be caught himself. Ana and Hans marry. Ralph declares his love to Tessa, and moves his business to England so that he can help her on a project to clean up plastic waste in the oceans.