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.

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.