Interstellar Pig (Mass Market Paperbound)

When three unusually attractive young adults rent the summer cottage next door, Barney's boring vacation at the beach seemingly takes a turn for the better. However, after the neighbors unwittingly reveal their extraterrestrial identities, the board game they have taught him becomes a real-life battle, and Barney must outsmart the aliens to save Earth from destruction. The fantastical tale contains some of Sleator's most inventive characters.