Spy Set (Hardy Boys: Undercover Brothers, #1-4)

Four cases. Two brothers.One mission:

Justice.

Follow Frank and Joe Hardy through their first four cases working as undercover agents for ATAC (American Teens Against Crime) as they crack cases and catch criminals left and right.

But be forewarned:

The road to justice is “anything” but smooth.

Books in this set include:

“Extreme Danger

Running on Fumes

Boardwalk Bust

Thrill Ride”