Related Clues:
- Cloak-and-dagger
- Like some documents
- Like some handshakes
- It's not to be told
- Confidential, not to be revealed
- Private, hidden
- Hidden, covert
- Hidden, private
- Covert, private
- Most confidential , not to be leaked on any account
- Confidential or mysterious
- Kept hidden from others
- 'Hidden, covert (6)'
- Not seen or know by others
- There's about a hundred trees there, but don't tell anyone