fully agree, whole series worth a read.
Wilbur Smith Courtney &Ballantyne series although a recent one Golden Lion with co-writer Giles Kristian really disappointed with ending seeming like was writing away and suddenly told to wrap it up quickly.
Other Wilburs enjoyable as well, only one above has disappointed.
Robert Ludlum, especially Bourne trilogy, films do not touch the depth and intricacy of the books.
Robyn Young 2 x trilogies around Robert the Bruce and Templars
Terry Hayes I am pilgrim