An incorrect letter in Emma Rothner's e-mail inadvertently ends up with linguist Leo Leike instead of the intended recipient. Leo answers. An exchange takes its course, which becomes funny and more and more personal. Because they do not know each other, they need not fear loss of face; they trust in each other about intimate things. Emma and Leo make a digital friendship and want to leave it at that. But at some point there are butterflies in the bellies and every "pling" in the mailbox shakes them up. Maybe they should meet after all? On the other hand, Emma is married to Bernhard and Leo is still hanging onto his ex-girlfriend Marlene.