Not pure Ludlum - "Since his death, the Estate of ... worked with a carefully selected author ... to prepare and edit this work for publication." No mention if it's Lustbader Eric Van.
The novel itself sees Hal Ambler in a fairly similar premise to [b:The Bourne Identity|1355615|The Bourne Identity (Jason Bourne, #1)|Robert Ludlum|http://ecx.images-amazon.com/images/I/31CWWXX8A1L._SL75_.jpg|859111]. That is, he's lost his memory and must fight to work out who and what he is. The differences are that instead of being rescued by some fishermen he's in an, 'off-the-books', psychiatric facility. The patients are all kept medicated to keep them under control and to keep the secrets they know out of the public eye. Ambler doesn't belong though, he's been hidden there without good reason and must escape and find out why.