The fourth and final film of the Ellery Queen series that Ralph Bellamy starred in has the mystery writer checking into a hospital that grande society dame Blanche Yurka has endowed. Later on when Yurka is killed there are a lot of suspects at home and in the hospital. Her two children Leon Ames and Jean Fenwick who are about to be cut from her will for instance. Doctor in charge of the hospital George Zucco has a vested interest as does gangster Paul Hurst whom Ames is into for a lot of money. Not to mention all kinds of hospital staff and patients.
Two more deaths occur before Bellamy, girl Friday Margaret Lindsay and Inspector Queen played always by Charley Grapewin figure it all out.
There's more comedy in this Ellery Queen mystery than in any of the others I've seen, a lot of it involving Paul Hurst trying to break out of the hospital with the 'help' of his chief gunman Tom Dugan. Bellamy and Lindsay get a few laughs as well with her sneaking into the hospital disguised as a nurse.
Ellery Queen And The Murder Ring was a good farewell for Ralph Bellamy in the series.