| Clue | Source | Date |
|---|---|---|
| A spirit, listed on the outside of can, is a secret remedy (7) | ||
| Ultimately terrific article probing a strange mystery | ||
| Prison implicated in a peculiar secret | ||
| Deep secret | New York Times | 24 Jan 2021 |
| A singular mystery | The Times Specialist Sunday | 12 Aug 2018 |
| Secret John introduced to Lily | ||
| Secret bit of knowledge | ||
| Deep mystery | ||
| Secret | ||
| Secret. | ||
| Secret or mystery. | ||
| A secret and marvelous remedy. | ||
| Elixir. | ||
| Mystery. |