Join Guilford Center Stage for a thrilling night of theater with a pair of one-act Agatha Christie mysteries.  One, Yellow Iris, was originally scripted by Christie as a radio play, and it’s now been published as a stage play featuring the famous Hercule Poirot.  The other, a Miss Marple, is The Thumb Mark of St. Peter, adapted from an Agatha Christie short story by Springfield VT playwright, and Agatha! director Miles Ledoux.