The real estate manager Dieter Schalenbach has been found dead by a secretary Sandra Zech.Dieter Schalenbach has received a shot in the heart.A florist Raffael Holst is very angry because Dieter Schalenbach had increased the rent (Sandra recently separated from him).Other important suspect is Ruth Schalenbach,his spouse because his husband wanted to divorced and then the good life will be finished.And Martin Ronnewald , a former-convict who has moved to Munich and bought an apartment to Dieter Schalenberg.