This book was first published in 1966, 100 years after Mary Baker Eddy's discovery of Christian Science. This original first volume in Robert Peel's trilogy examines the influences upon Mrs. Eddy's developing thought up to the decisive appearance of Science and Health.

Released in 2023, this new edition of The Years of Discovery has a refreshed design improving readability and ease of use. All references have been updated and corroborated, providing insight into original sources and conveniently positioned as footnotes rather than endnotes. This edition includes a new foreword, chronological outline and Baker family tree, a section of archival image plates with thorough image credits, an index, and a complete bibliography.

The new edition is hardbound. 441 pages.