Sony's Columbia Classics line debuts three more of the film noir mysteries in the Whistler series: The Secret of the Whistler (1947), The Thirteen Hour (1947), and The Return of the Whistler (1948) on DVD for the first time.

Based on the popular radio program, actor Richard Dix starred in eight different Whistler films. The first film and its second sequel were put out by Sony last month and another two were released at the beginning of June. The Mark of the Whistler (1944) remains unreleased and it's expected that Sony will premiere that in due time.

The studio is releasing the sports drama Smith of Minnesota (1942) alongside the Whistlers.

All will be available here at ClassicFlix on July 14th. These new DVDs add to the total of over 250 Columbia Classics titles exclusively available for rent at ClassicFlix.com.