The Curse of the Delba
In this, the fourth book in the Super Sporty series, Sporty and Harley uncover a terrible secret: one of their best friends is really a mysterious supervillain called the Delba! Trapped in the Delba's volcano lair, Sporty and Harley are faced with two dilemmas: What is Operation Freeze? And how are they ever going to get out alive?
If you like horses, if you like superheroes, if you like adventure and aliens, then you'll love Super Sporty and the rest of the Horsecitty gang.