Bulletproof — Lawrence Rotch

When Oliver Wendell moved to Maine ten years ago and took up boat building, he planned to leave the past behind. Then his old friend and former co-worker, computer genius Frank Carlson, dies and Oliver learns the past is harder to put aside than he thought, especially when a cold-blooded killer decides to use him as the pawn in a deadly game.

It starts when Oliver agrees to spend a couple of weeks tying up some loose ends left over from Frank's death. All too soon he and his friend Sarah Cassidy find themselves caught in the cross-hairs of a ruthless computer software tycoon, an over-zealous government agent, and a vengeful widow, as the pair confront pirates and hit squads to track down a murderer.