Das Glück klopft an die Tür: At the reading of her late husband's will, Gila Maibach learns that there is a co-heiress to her beloved house! At first, Gila is convinced that the attractive Maja is her husband's mistress. However, the perky florist soon turns out to be Lothar's secret daughter. As Gila is unable to pay Maja her inheritance, the heavily pregnant young woman and her young son Max move in with the completely bewildered widow without further ado.