Oil on the Balcony is an original Slovenian detective novel and also Demšar’s debut book. It is the first novel in the series of cases worked by Superintendent Vrenko. In a block of flats by the Drava river where well-off people lived, a cleaning lady finds the body of Doctor Potokar in one of the flats. At first it appears to be suicide, but Vrenko and his young assistant Marko Breznik discover the doctor’s colossal secret in a locked cupboard, a secret that incriminates many people...