I read the other five books in this series years ago. This, the sixth and final episode, was published last year, I found it in a charity shop in Seaford last week.
I think my reading tastes have moved on!! It's well researched and detailed, but completely lacks plot! I'm at 300 of 800 pages so far and only sticking with it out of sheer doggedness! Nothing much is happening apart from descriptions of cave paintings.
It has been a while since I picked up a book and was gripped by page 3. The next one will have to be carefully chosen from Mount TBR (to be read).