Related Clues:
- One not to be divulged
- Something hidden from E. Phillips Oppenheim and Laurence Binyon
- Not known by others
- Security classification level
- Entomb French king in retreat upcountry
- Cloak and dagger
- Security marking
- Blur success, obviously full of feeling
- Situated inside
- Heartland
- Not known to others
- Hidden; unknown
- The heart? Bury on outskirts of city
- Private sort of design for its minister?
- Confidence shown by religious group carrying on