A Book Name "The Secret Mark An Adventure Story for Girls" Author By Roy J. Snell Was Published in 1923. Adventure Stories for Girls

1. The Blue Envelope
2. The Cruise of the O’Moo
3. The Secret Mark
4. The Purple Flame
5. The Crimson Thread
6. The Silent Alarm
7. The Thirteenth Ring
8. Witches Cove
9. The Gypsy Shawl
10. Green Eyes
11. The Golden Circle
12. The Magic Curtain
13. Hour of Enchantment
14. The Phantom Violin
15. Gypsy Flight
16. The Crystal Ball
17. A Ticket to Adventure
18. The Third Warning