The Chaos Experiment

The Chaos Experiment also billed before release as The Steam Experiment is a 2009 independent suspense thriller directed by Philippe Martinez and starring Val Kilmer, Armand Assante, and Eric Roberts.

As Pettis describes developments in the streamroom to Mancini, the scene is shown of three men and three women meeting in the steamroom of a luxury hotel as part of an online dating promotion, then being locked in there together. When they discover that they have been locked in, they react badly Frank Quinn Duffy becomes abusive to Jessie Eve Mauro, and is killed in her defense by openly neurotic Margaret Cordelia Reynolds. Jessie is killed with a nail gun by an unseen assailant when she pokes her head through the small window in the steamroom door Christopher Patrick Muldoon is injured in the hand with a nail as the window is boarded over from outside. Margaret becomes agitated and commits suicide. Grant Eric Roberts is bludgeoned by Catherine Megan Brown after he accuses her and Christopher of being allies of the perpetrators, and repeatedly holds her head underwater.Mancinis call to Pettis psychiatrist finally brings staff from the local state psychiatric hospital, from which Pettis recently escaped. It is revealed that Christopher and Catherine are staff at this facility, and are unhappy with Pettis for going to the news media and police with this story. ........

Source: Wikipedia