My Pants are Haunted! (Dear Dumb Diary, #2)

Jamie Kelly thinks her pants are haunted. What else can explain all of the strange things that have been happening. All the rest of her jeans suddenly have holes in the worst possible locations. She blames her dog, but maybe it's the haunted jeans. The most unpopular girl at school moved quickly up the ranks to sit at the cool kid table, pushing Jamie to the bottom fringes of popularity. Clearly the work of those jeans. What can Jamie do to stop the jeans before it's too late?

Artemis Fowl : The Time Paradox by Eoin Colfer

Artemis Fowl is in deep again. It has been three years since his last adventure. He had to do a memory wipe on his parents so they won't remember his strange disappearing and reappearing acts. But it seems that Artemis has caused his mother harm with his stolen magic. He has given her a deadly fairy virus. The only cure seems to come from an African lemur. However, the very lemur that Artemis needs has been killed off, and Artemis was the one who eliminated the species! Now, with the help of Holly Short, he must travel back in time to stop the lemur's death. But traveling back in time will put Artemis up against his greatest foe yet, a younger version of himself!