- Trixie Belden and the Mysterious Code (Trixie Belden, #7)
- Trixie Belden and the Black Jacket Mystery
- Trixie Belden and the Happy Valley Mystery (Trixie Belden, #9)
- Trixie Belden and the Mystery of the Castaway Children (Trixie Belden, #21)
- Trixie Belden and the Mystery of the Phantom Grasshopper (Trixie Belden, #18)
- William Arden
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