Playwrights Anthony Ruivivar (an actor on NBC's Third Watch) and Tony Glazer (a writer on the same show) offer an intriguing premise in their 2003 off-Broadway play. Three bank employees and two customers are locked in a room-size safe after a robbery--along with a huge stash of money. Was there really a robbery? Is one of the victims actually the perpetrator? Unfortunately, the premise is all that's interesting. The playwrights strive to examine human nature at its worst, but for 90 minutes their script lurches from cliche ("We're running out of air!") to improbability (it's 15 minutes before the characters remember they have cell phones)--problems exacerbated by the generally self-conscious, uncertain performances from director Dale Goulding's cast. Through 10/8: Thu-Sat 8 PM, Sun 3 PM. Athenaeum Theatre, third-floor studio theater, 2936 N. Southport, 312-902-1500. $15-$20.