Fin Spencer is in BIG trouble. He upset Mrs Johnson, and now he's not going on the class trip. But he has to, after all he's a born action hero! Stevie Knuckles Action Camp is where Fin belongs. So it's time to use the diary again - if he can just tweak what happened today, he'll be on his way to fame, fortune and fearlessness once again. But the diary has a naughty habit of backfiring . . . Ca…