| The second William Penn
W. H. Ryus | |
| The Second-Story Man
Upton Sinclair | |
| The Secret Adversary
Agatha Christie | |
| The Secret Agent: A Simple Tale
Joseph Conrad | |
| The Secret Battle
A. P. Herbert | |
| The Secret Battleplane
Percy F. Westerman | |
| The Secret Cache: An Adventure and Mystery Story for Boys
Ethel C. Brill | |
| The Secret Chamber at Chad
Evelyn Everett-Green | |
| The Secret Chart; or, Treasure Hunting in Hayti
James Otis | |
| The Secret City
Hugh Walpole |
