Counterfeit Son, by Elaine Marie Alphin, published by Houghton Mifflin. US-only, according to the greyed out purchase button, so I couldn't check the length, but looks like it's a full book and not a preview. Apparently this was an Edgar Award winner in 2000.
Product Description
Cameron Miller is pretending to be someone he isn't. When he began presenting himself as Neil Lacey, it was the only way he could think of to distance himself from what Pop had done, to finally climb out of his nightmarish existence. He thought it would be easy--playing the rich kid, sailing his boat--but he didn't count on Cougar. Now Cougar, his father's old accomplice, has tracked Cameron down and presented an ultimatum: Share the wealth or be exposed. Will Cameron give up his new identity to protect Neil's family? Or will he let his search for a new life destroy those around him?