Mystery In Rocky Mountain National Park (National Park Mystery Series)

The Boxcar Children Mysteries Boxed Set 1-4: The Boxcar Children; Surprise Island; The Yellow House; Mystery Ranch

Holes (Holes Series)

InvestiGators: Class Action (InvestiGators, 8)

Quest in Yosemite National Park: A Mystery Adventure (National Park Mystery Series)

Gravity Falls: Lost Legends: 4 All-New Adventures!

The Secret Zoo

Nancy Drew Mystery Stories Books 1-4

Adventure in Grand Canyon National Park: A Mystery Adventure (National Park Mystery Series)

Discovery in Great Sand Dunes National Park: A Mystery Adventure (National Park Mystery Series)