The Spy's Secret (Key Hunters #2): Volume 2

Unlocking adventure...one key at a time! A SPY MUST BE READY FOR ANYTHING! Agents Cleo and Evan have been given an impossible mission: become superspies and foil the plans of an evil mastermind. But it won't be easy to break into the Viper's secret underwater lair, complete a daring rescue, find the right key, and get out alive! Keep hunting!