Readers have known Who Okayed This?! The Riveting Life of Grant Davis by Philip E. Barrington is “un-put-downable” since it came out two years ago. The juicy, suspense-filled thriller has keep book enthusiasts hooked with page-turning drama, filled with farcical (or are they?) twists and turns from the imagination of Barrington. So much so, producers are circling, anxious to turn the tome into the next big thriller. Described as a mix between The Fugitive and Forrest Gump, the quirky, fast-paced novel follows the rollercoaster life of Grant Davis, a regular guy who finds himself tangled in a p…