'30's or '40's Thriller where a corpse is found within the walls of a girls Catholic School or convent.

[Dino]

My late mom's favorite. Lost in a move. Can't remember the title.

[Lobstergirl, au gratin]

Author's gender?
Series?
Set where and when?

[Kajehas]

Dino wrote: "My late mom's favorite. Lost in a move. Can't remember the title."

St. Peter's Finger 1938

[Kris]

Amazon's preview (sample) of St. Peter's Finger by Gladys Mitchell - Kajehas's suggestion:

https://www.amazon.com/St-Peters-Fing...
There are different cover images.

[Dino]

Author's gender?
- Not sure. Likely female.
Series? No
Set where and when?
A coastal church or girls' school. Dead remains of a woman or nun are found in old walls.

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[KeenReader]

Could it be The Broken Girls?

[Dino]

No. Thanks for trying tho.

[Dino]

Kajehas wrote: "Dino wrote: "My late mom's favorite. Lost in a move. Can't remember the title."

St. Peter's Finger 1938"

not it. appreciate the suggestion tho.

[Rainbowheart]

What year did your mom read it, approximately?

[Denis]

Not likely, but check The Walls Came Tumbling Down by Babs H. Deal