In Rupert Holmes's comedy thriller two couples switch lovers, identities, and murder motives so often that we don't know till the last minute who's screwing whom (in every sense). The cast navigates the hairpin turns with nary a bump, enhancing Holmes's wit with just enough ham--especially Laura T. Fisher, whose vocal swells and gestures say as much as the dialogue, and Amanda Christensen, who plays dumb blonde as only a very smart woman can. Director Matthew Reeder has fine-tuned the ensemble in this Noble Fool Theatricals production, and the payoff is big. To divulge more would be deadly, but whether or not you can predict whodunit--and who's doing it--it's a most enjoyable ride. Through 3/18: Wed-Fri 8 PM, Sat 4:30 and 8:30 PM, Sun 2 PM, Pheasant Run Resort & Spa, 4051 E. Main (Rte. 64), Saint Charles, 630-584-6342, $27-$37.