The volume contain 3 books:
Book 1 - A history of Golden Dawn
Book 2 - Z5
Outer order rituals of the Whare Ra Temple
A commentary on the Outer Order Rituals
Book 3 - Z4
Inner Order Rituals of the Whare Ra Temple
A commentary on Inner Order Rituals

Pat Zalewski write about Z5 book:
"The Z.5 document was originally intended to be restricted to members of the Inner Order of Thoth-Hermes [i.e. the Temple that Pat himself started together with his wife Chris in New Zeeland, after meeting Jack Taylor and the ex Whare Ra Adepts]. It included many of the "word of mouth" teachings passed on by [Jack] Taylor and other Inner Order Adepti from Whare Ra under whom we trained."

This book give a commentary on each ritual up to 5=6 level
All ritual diagram are included and explanation are given separately for each diagram
Godform drawings are included, along with coloring instruction
and so much more.