Covert One Series

Like a lot of authors, Ludlum, shortly before his death had arranged to co-author a separate series. Unlike some of the others the Covert One books are reasonably good. How long the franchise lasts remains to be seen. The output from the Ludlum estate proceeds apace. How many books can there be? The Covert One series has settled down, we have a series with well bedded characters and some interesting plot lines.