I've been reading Penman's books for over 20 years now and have always really liked them. However, I didn't really enjoy the style of info dumping in this book and that affected my overall enjoyment of the book.
The book focuses on King Richard's return from the crusades, his capture/imprisonment and his final war with the King of France. I felt like too much activity was kept off camera, which led to characters telling each other of past events to catch the reader up. If you like Penman's work, I'd recommend this, but definitely not as a jumping off point for new readers.
Robert Ludlum never fails to disappoint. I didn't realize that this is a sequel to the Matarese Circle, but that didn't seem to matter too much - it was easy to keep up with past events. However, the format of the book seems to follow the Bourne series closely, sometimes it seems that only the character names are changed.
The plot involves current and former CIA agents trying to stop a secret organization (the Matarese) from dominating the world's economy for their own personal financial gain. I thought the plot was interesting, but trying to follow the plans of the Matarese was sometimes difficult.
I would definitely recommend this to anyone who regularly reads the genre.