The book is available at Internet Archive, Sacred Texts, and Hathi Trust. The links below are to the Sacred Texts version.
II: The King's Dream
III: The Coming of the Great Queen
IV: The Book of Thoth
V: Osiris
VI: The Scorpions of Isis
VII: The Black Pig
VIII: The Battles of Horus
IX: The Beer of Heliopolis
X: The Name of Ra
XI: The Regions of Night and Thick Darkness
And here's a short video I saw at Twitter about Margaret Murray:
New Pod: The Egyptologist https://t.co/Jw0euZ61jO @k8shep discusses the woman at the heart of turn-of-the-century British archaeology. @trowelblazers @dig_history @ladyxscience pic.twitter.com/vUw14Tyt6j— Time to Eat the Dogs (@eatthedogs) January 23, 2018