Summy's an expert on science fiction. He's read all the books. Seen all the films. But his parents think he's wasting his time. They're research scientists and only believe in real science.
Then someone - something? - moves into Sammy's room. Wrecks it. Eats his food. Says he just wants to be Sammy's best freind.
Sammy knows he's in trouble. Strange creatures always want something. Your body. Your brain. Your blood. Something. But how do you get rid of an unwanted freind... whan he's invisible?