Summit has been enjoying the buzz they've attracted with the Bruce Willis comic adaptation Red ever since the debut of that crazy fun trailer and a well-recieved Comic-Con panel.  Now the studio is looking to Red screenwriters Erich and Jon Hoeber to beef up the script of another property on their development slate, the Sam Worthington heist thriller Man on a LedgeHeat Vision describes the premise like so:

The story begins when an ex-cop-turned-con threatens to jump to his death from a Manhattan hotel rooftop. The NYPD dispatches a female police psychologist to talk him down but, unbeknownst to the cops on the scene, the suicide attempt is a cover for a massive diamond heist.

Summit hopes to have a rewrite ready in time for a fall or winter shoot, before Worthington is called away to the Clash of the Titans sequel.  In addition to Red, the Brothers Hoeber scripted Peter Berg's Battleship adaptation; pop singer Rihanna recently deemed the script worthy of her feature film debut, if that's any indication of its quality.