Thanks for the recommendation, Stephen! The book that introduced me to Grace Cook and White Eagle was Arthur Conan Doyle's Book of the Beyond, and I will look forward to locating the book you mentioned.
All the best,
Nick
Excellent book on the fundamentals of mediumship by Grace Cooke the channel for White Eagle!
Although this volume was 1st published in 1965 it seems still to be very relevant for today's aspiring mediums, as it is concise and to the point.
Enjoy,
Stephen