Karla Unruh is found hanged in the basement of house of her house.Because Karla was poisened by cyanide, so it's not a suicide, it's a murder and who can be the first suspect ? Her husband, but his has an alibi.But it's a weak alibi,There is also the son of Karla, Karsten who was always asking his mother for money and he also has an alibi.What did really happen ?
An interesting criminal investigation with good actors : Gerd Böckmann,Marianne Nentwich, Mick Werup, Sabine Kraack and Rudolf Wessely.