Both the original Eogan book on Knowth and the Kelly Newgrange books are excellent, but not really useful as guide books. From the Eogan book I liked the fact that the surname of the first person to enter the second passage was Stone. In both books the sheer delight of each new discovery is obvious, but discovering the second passage in Knowth takes the medal when it comes to levels of wonderment.

Inside The Neolithic Mind is on my list of must-reads. I might just have time this month.