Ellery Queen - Adventure of the Wary Witness

Author and amateur detective Ellery Queen attempts to solve another murder. Ellery's old college chum, Linville Hagen, is accused of murdering mobster Nick Danello and Ellery must find a missing witness who can prove his innocence. This missing witness was a woman wearing a green dress - a description that could fit any woman in New York. Frank Flannigan comes along for the ride too, and this time he's not quite so antagonistic towards Ellery.