Robert Ludlum's The Bourne Legacy

A man without a past is washed into the nets of a fishing boat with no idea of who he is or how he got there. All he has is a passport in the name of Jason Bourne. Over the course of three books, The Bourne Identity, The Bourne Supremacy and The Bourne Ultimatum, he gradually comes to realise who and what he really is - a strange amalgam of a man named David Webb, and a deadly killer: Jason Bourne. Now David Webb is living a peaceful life as a university professor in the backwoods of America with his wife and children. But someone is reaching out to take him out of the game forever. A deadly assassin is on his trail and his former handler has been brutally murdered already. It seems that David Webb must once again turn to Bourne to save his life and family.