Never

I find it difficult to review this book. Basically, Ken Follett has chosen to write a story illustrating how easy it would be for things to go very badly very quickly. As usual with a Follett book, the story is well written. It is peopled with believable characters some of whom I became quite invested in.
There are two basic story lines. The first follows covert and overt activities to counter jihadist criminals operating in North Africa. The second and main story line follows high-level geopolitical maneuvering and brinkmanship with literally everything on the line.
I really cannot say much more without giving things away. (The cover text will tell you pretty much what to expect.)
I dropped this book to four stars because an occurrence in the first story line pushed my WSOD a bit too far. At one point, some of the main characters were captured by slavers, but the captors didn't search them and steal everything they had. Difficult to believe.
Anyway, a long but entertaining read – very tense, very exciting. However, proly not the best book for you if you have to have a happy ending.