Invasion from the Planet of the Cows (Maximum Boy)

Eleven-year-old Max Silver, a.k.a. Maximum Boy, and his older sister Tiffany, who has recently gained super powers she almost knows how to use, must save the world from cows from space who have returned to Earth to check up on their colonies.
ASIN: 0439219477
VSKU: RDV.0439219477.G
Condition: Good
Author/Artist:Greenburg, Dan
Binding: Paperback