In this exhilarating and high-intensity action adventure, Miami narcotics detectives Mike Lowrey (Will Smith) and Marcus Burnett (Martin Lawrence) uncover a deadly conspiracy involving a ruthless drug lord determined to take control of the citys burgeoning narcotics trade. The assignment takes on further complications as Marcus beautiful sister Syd (Gabrielle Union), an undercover DEA operative, gets caught in the crossfire, and romantic sparks start to fly between Mike and the lovely but now endangered agent.