Maigret is to find out who shot old Lapie. His maid, who inherits his entire fortune, is a suspect. The pretty Félicie comments on Maigret's interrogation with a few spirited remarks, but is otherwise silent. Maigret doubts the young woman's guilt, suspecting more the dead man's neighbours, Louvet, Bazène, Forrentin and Joseph. The inspector is surprised when he reads in Félicie's diary ... Based on the 25th Maigret novel Félicie est là (1944), published in German as Maigret und das Dienstmädchen.