Franz Hartmann, who also wrote the esoteric novella With the Adepts, published this short non-fiction summary of the Rosicrucian question in 1890. He reviews the well-known history and literature of the Rosicrucians. In the last two chapters Hartmann presents what he believes to be the core doctrines of the 'true' Rosicrucians.
Hartmann authored In the Pronaos of the Temple of Wisdom, serving as what he hoped would be an introduction to hermetic philosophy.