For additional details, see my blog Reading the Mystery League. Each title below is linked to my synopsis/review.
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No. | Title | Author | Year |
| 1 | The Hand of Power | Edgar Wallace | 1930 | |
| 2 | The Curse of Doone | Sydney Horler | 1930 | |
| 3 | The House of Sudden Sleep | John Hawk | 1930 | |
| 4 | Jack O'Lantern | George Goodchild | 1930 | |
| 5 | The Mystery of Burnleigh Manor | Walter Livingston | 1930 | |
| 6 | The Invisible Host | Gwen Bristow and Bruce Manning | 1930 | |
| 7 | * The Day of Uniting | Edgar Wallace | 1930 | |
| 8 | * The Monster of Grammont | George Goodchild | 1930 | |
| 9 | * The House of Terror | Edward Woodward | 1930 | |
| 10 | * The Hardway Diamonds Mystery | Miles Burton | 1930 | |
| 11 | * Peril | Sydney Horler | 1930 | |
| 12 | The Maestro Murders | Frances Shelley Wees | 1931 | |
| 13 | Turmoil at Brede | Seldon Truss | 1931 | |
| 14 | Death Walks in Eastrepps | Francis Beeding | 1931 | |
| 15 | The Secret of High Eldersham | Miles Burton | 1931 | |
| 16 | The Gutenberg Murders | Gwen Bristow and Bruce Manning | 1931 | |
| 17 | The Merrivale Mystery | James Corbett | 1931 | |
| 18 | The Tunnel Mystery | J. C. Lenehan | 1931 | |
| 19 | The Mystery of Villa Sineste | Walter Livingston | 1931 | |
| 20 | The Hunterstone Outrage | Seldon Truss | 1931 | |
| 21 | Murder in the French Room | Helen Joan Hultman | 1931 | |
| 22 | Bungalow on the Roof | Achmed Abdullah | 1931 | |
| 23 | The False Purple | Sydney Horler | 1932 | |
| 24 | Two and Two Make Twenty-Two | Gwen Bristow and Bruce Manning | 1932 | |
| 25 | For Sale - Murder | Will Levinrew | 1932 | |
| 26 | The Ebony Bed Murder | Rufus Gillmore | 1932 | |
| 27 | Spider House | Van Wyck Mason | 1932 | |
| 28 | The Mardi Gras Murders | Gwen Bristow and Bruce Manning | 1932 | |
| 29 | The Stingaree Murders | W. Shepard Pleasants | 1932 | |
| 30 | Death Points a Finger | Will Levinrew | 1933 | |
| 31 | ** Death Holds the Key | Frome, David | 1933 |
* Issued simultaneously in a boxed set of five as a Christmas promotion.
** #31 was announced to be Death Holds the Key by David Frome. The League did not survive to publish it. It was later published by Grosset and Dunlap under the title Scotland Yard Can Wait!