Books with title A.U.X.Y. Spies

Blu and A.U.X.Y. group are up for a new adventure. The have to be someone's bodyguard: Casper Justice. This is a new type of mission. This time, they will be helping an old friend. They have to find the people who are going after Casper before they get to him first, but things will not be what it seems. This will be an exciting fourth book of the Unimaginable series.