This episode is about Sam Cowling's "The Limits of Modality" published in the Philosophical Quarterly in 2011.
Are all true propositions either contingent or necessary? Cowling argues that if we want to understand the metaphysics of modality in terms of possible worlds we should maintain that certain true propositions are neither contingent nor necessary but just true simpliciter. Is this conceptually coherent? Have a listen and make up your mind!
Here's a link to the paper.