I admit that I don't follow him closely, but I found this very interesting:

Yet for all the sales figures and superlatives, it is somehow fitting that a novelist who specialised in complex conspiracy theories and international espionage should have left behind a conundrum to baffle even Bourne himself. In the years since his death, 12 new works bearing his name have hit the bookshelves and beach-towels of the world. None was penned by Ludlum himself – and at least three have not been credited to any other writer. These include The Bancroft Strategy, published last year, which sold 102,000 copies in hardback alone. Like Bourne, whose life after death underscores the basis of the film trilogy, so too has his creator found a new identity in his afterlife.

Lengthy article here: