The Thirteenth Floor is a 1999 science fiction crime thriller film directed by Josef Rusnak and loosely based upon Simulacron-3 (1964), a novel by Daniel F. Galouye. The film stars Craig Bierko, Gretchen Mol, Armin Mueller-Stahl, Vincent D'Onofrio, and Dennis Haysbert. In late 1990s Los Angeles, Hannon Fuller (Armin Mueller-Stahl) owns a multi-billion-dollar computer enterprise and is the inventor of a newly completed virtual reality (VR) simulation of 1937 Los Angeles, filled with simulated humans unaware they are computer programs. When Fuller is murdered just as he begins premature testing of the VR system, his friend and protégé, Douglas Hall (Craig Bierko), who is also the heir to the company, becomes the primary suspect. The evidence against him is so strong that Hall begins to doubt his own innocence.