This thesis details the development of the full-length play, "The Curious Case of Agatha Christie." This hour-long comedic mystery was performed as part of the Big Muddy New Play Festival at the SIUC Department of Theater and Dance in February of 2022. In this comedic mystery, famous crime novelist Agatha Christie goes missing. Avid mystery novel fan and aspiring journalist at lady’s magazine Gentlewomen’s Gazette, Helen Casewell, sets out to uncover the truth behind Agatha Christie’s disappearance. The thesis begins in chapter 1 by discussing the origins for the script and the research process. Next, in chapter 2, the thesis details the writing and editing process which took place over the Fall 2021 semester in the New Play Development class. Chapter 3 of the thesis retells the pre-production process. The production is chronicled in chapter 4. Finally, chapter 5 contains an overview of my professional and creative development during my graduate studies at SIUC.