Secret page alters the actual contents of a page so that they appear to be something entirely different. Thus, a map can be changed to become a treatise on burnishing ebony walking sticks. The text of a spell can be changed to show a ledger page or even another spell. Explosive runes or sepia snake sigil can be cast upon the secret page.
A comprehend languages spell alone cannot reveal the secret page’s contents. The character is able to reveal the original contents by speaking a special word, perusing the actual page, and then returning it to its secret page form at will. The character can also remove the spell by double repetition of the special word. A detect magic spell reveals dim magic on the page in question but does not reveal its true contents. True seeing reveals the presence of the hidden material but does not reveal the contents unless cast in combination with comprehend languages. Secret page can be dispelled, and the hidden writings can be destroyed by means of an erase spell.