Interesting that about five years before all the sex scandals started breaking with the Catholic Church, this Perry Mason mystery is about a nun accused of murder because she was trying to cover up an affair with a priest.
In Perry Mason: The Case of the Notorious Nun the eminent criminal lawyer is now defending Michele Greene who was working with Father Timothy Bottoms doing an audit of a Catholic hospital. But a letter in her room sent to her by Bottoms implicates her big time when he turns up dead.
But these two frocked accountants uncover a lot of pilferage from that hospital, in fact it was Archbishop William Prince who retains Raymond Burr to defend Greene. This other sin, this nonsexual one opens up a host of other suspects.
Perry Mason always had a G rating and the sex among clergy is a topic treated most gingerly. Still Greene's not certain whether she can take her final vows in the end.
David Ogden Stiers made the first of eight appearances as the District Attorney and James McEachin was in nearly all the rest of the Perry Mason films as Sergeant, later Lieutenant Ed Brock.
This is one of the better Perry Masons as we discover just which commandments are broken that provide a motive for a homicide. Come to think of it, that's a commandment as well.