Miss Perry. A Play in Two Acts

Unpublished

According to Collecting Christie and the article Christie's still unpublished works (2022):

"This two-act play has /.../ not been performed. Potentially written in the early 1960s (some believe 1964), it is referenced in one of Christie's notebooks (#53) from that period. The playscript is 80 pages long. It was common for Christie's agent to send copies of manusripts out to various theatrical producers to see if there was interest. It implies that her agent at the time, Hughes Massie & Co, believed this play has qualities worthy of production."