The Matter of a Murder of a Maid

Two socialite sisters in 1930s Boston take it upon themselves to help the police in crime detection. Armed with fountain pen, notepaper, a Mercedes Benz roadster, and plenty of lipstick, Kate and Betty Hadley can fulfill their dreams of living on the edge of excitement as they hunt for clues, gossip and society pages. They don't have to look for trouble. Trouble just finds them.
When Kate and Betty are contacted by their next-door neighbor asking if they have seen her maid, they get suspicious. The girl is a recent Irish immigrant with few friends. The sisters take it upon themselves to interview the girl's few friends and try to retrace her steps the night she disappeared. What happened to Mary?