| The Secret Dispatch; or, The Adventures of Captain Balgonie
James Grant | |
| The Secret Doctrine, Vol. 1 of 4 / The Synthesis of Science, Religion, and Philosophy
H. P. Blavatsky | |
| The Secret Doctrine, Vol. 2 of 4 / The Synthesis of Science, Religion, and Philosophy
H. P. Blavatsky | |
| The Secret Doctrine, Vol. 3 of 4 / The Synthesis of Science, Religion, and Philosophy
H. P. Blavatsky | |
| The Secret Doctrine, Vol. 4 of 4 / The Synthesis of Science, Religion, and Philosophy
H. P. Blavatsky | |
| The Secret Garden
Frances Hodgson Burnett | |
| The Secret Glory
Arthur Machen | |
| The Secret Guide to Computers
Russ Walter | |
| The Secret History of the Court of Justinian
Procopius | |
| The secret history of the court of Spain during the last century
Rachel Challice |
