Interstellar Pig Series by William Sleator

Barney is all set to spend two weeks doing nothing at his parents' summer house. But then he meets the neighbors, and things start to get interesting. Zena, Manny, and Joe are not your average folks on vacation. In fact, Barney suspects they're not from Earth at all. Not only are they physically perfect in every way, but they don't seem to have jobs or permanent addresses, and they are addicted to a strange role-playing game called Interstellar Pig... moreBarney is all set to spend two weeks doing nothing at his parents' summer house. But then he meets the neighbors, and things start to get interesting. Zena, Manny, and Joe are not your average folks on vacation. In fact, Barney suspects they're not from Earth at all. Not only are they physically perfect in every way, but they don't seem to have jobs or permanent addresses, and they are addicted to a strange role-playing game called Interstellar Pig. As Barney finds himself sucked into their bizarre obsession, he begins to wonder if Interstellar Pig is just a game. less

The daring game of intergalactic chase that thrilled a generation of science fiction readers in Interstellar Pig has started again, and round two is deadly! This sequel to William Sleator's sly masterpiece takes readers on another hunt for the sinister Piggy, this time in the far reaches of space.Poor Barney has a boring after-school job, earning money to repay his parents after their beach house is destroyed in a battle with aliens. Of course, they don't believe that aliens did the damage... moreThe daring game of intergalactic chase that thrilled a generation of science fiction readers in Interstellar Pig has started again, and round two is deadly! This sequel to William Sleator's sly masterpiece takes readers on another hunt for the sinister Piggy, this time in the far reaches of space.Poor Barney has a boring after-school job, earning money to repay his parents after their beach house is destroyed in a battle with aliens. Of course, they don't believe that aliens did the damage. No one, in fact, realizes that sixteen-year-old Barney saved the world by outsmarting the visitors at their violent game, Interstellar Pig. No one but the aliens, and for them the game is far from over. Barney is about to be drawn into the contest again, becoming the unwilling partner of a chatty intestinal parasite; the potential snack of giant, man-eating crabs; and the competitor of a stinger-happy seven-foot wasp woman. Life just got a lot more interesting. less