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Ralph Bellamy made his fourth and final appearance as literary sleuth Ellery Queen in Columbia's Ellery Queen and the Murder Ring. On this occasion, Ellery and his police-inspector father (Charley Grapewin) are summoned to a private hospital by its owner, philanthropist Mrs. Stack (Blanche Yurka). There've been some very weird goings-on at the hospital as of late, and Mrs. Stack wants to get to the bottom of things. Soon after Ellery's arrival, however, the old woman is injured in a suspicious motor accident, then strangled to death on the operating table. Suspects include Mrs. Stack's avaricious son John (Leon Ames), head nurse Miss Tracy (Mona Barrie) and medical director Dr. Janney (George Zucco). Despite the fact that Ellery seems to be as dumb as a stone, he manages to solve the mystery. After Ellery Queen and the Murder Ring, Ralph Bellamy relinquished his Ellery Queen duties to William Gargan.