- Frozen CharlotteAlex Bell
- Charlotte SaysAlex Bell
- Frozen Charlotte (Red Eye)Alex Bell
- The Polar Bear Explorers' ClubAlex Bell
- The Haunting (Red Eye)Alex Bell
- The ninth circleAlex Bell
- Explorers at Stardust CityAlex Bell, Tomislav Tomic
- JasmynAlex Bell
- Explorers on Witch MountainAlex Bell, Tomislav Tomic
- The Forbidden Expedition (The Polar Bear Explorers' Club #2)Alex Bell, Tomislav Tomic
- Der Polarbären-Entdeckerclub 2. Insel der HexenAlex Bell
