In Denver, Colorado, in 1941, a man was found murdered in his own home. The most unusual part was that all of the doors and windows were locked from the inside. The question is just how was the killer able to make his getaway? (Images to accompany the story are below.)

I told this story to Matt and McKinley Breen, the father and son team who host the daily podcast History Dispatches, so make sure you listen to find out what really happened.

You can hear more episodes of History Dispatches at historydispatches.com.