The sex is great, and Hubertus and Charlotte have been one heart and one soul for years. It doesn't even bother Charlotte that she is married to Hubertus' unsuspecting brother Balthasar. But then Anastasia turns up at Hubertus' veterinary practice with her sick dog. The seductive Russian woman whispers a few pleasantries in the naïve doctor's ear and his hormones jump in triangles. Hubertus reinvents himself, dumps Charlotte - and discovers that Anastasia is the mistress of his snobbish surgeon brother Balthasar. Brave Hubertus decides to fight - the only question is for whom...