the Aaron and jake time travel

The Time Cavern
Website
Wikipedia (author's page)
ARBookfinder: there is an AR test, but it is not on AR bookfinder.
rating:4.5/5 (THIS BOOK IS SO AWESOME!!!!!!!!!!!!!!!!!!!!!!!!!!!!)

summary (beginning): Aaron hears his name being called by the wind. Then, the next day, a girl named Jacqueline(Jake for short) says "Just wait 'till you hear your name called by the wind." Will he ever get to the bottom of this?

The Inverted Cavern
website: see last link for website.
wikipedia: see last link for wikipedia
ARbookfinder: no test, no stats
rating: 3.5/5 (good book, understandable time logic)

summary:the Amish boy goes home. Jake and Aaron find their own handwriting in a dairy. aaron goes to the future, but he can't come home!

The Indian in the Cupboard

website: none
Wikipedia
ARBookfinder
rating: 4/5

Summary: a old cupboard and a unrelated key bring a unwanted plastic Indian to life. 

there are 4 more books that may be read and rated. 

The 39 Clues

Wikipedia
website
ARbookfinder (first book)
Series Rating 3.75 / 5

Summary:

The maze of bones
Rating 3.75 / 5

One false note
Rating 3.5 / 5

The sword thief
Rating 3.75 / 5

Beyond the grave
Rating 4 / 5

The Black Circle
Rating 4 / 5

In too deep
Rating 3.5 / 5

The viper's nest
Rating 3.5 / 5

The Emperor's code
Rating 3.5 / 5

Storm Warning
Rating 3.25 / 5

Into the Gauntlet
Rating 4.5 / 5

Vespers rising
Rating 3.75 / 5
This book is a bridge between this series and the Vespers vs. Cahills series