What if your teacher could read your mind just because she was born on a Thursday? Or the kid next to you in class could turn back the clock just because he was a 'Wednesday"? In the quirky town of Nova, all of this is normal, but one thing is not - Poppy Mayberry. As an almost-eleven-year-old Monday, she should be able to pass notes in class or brush her dog, Pickle, without lifting a finger. But her Monday telekinesis still has some kinks, and that plate of spaghetti she's passing may just end up on someone's head. And if that's not hard enough, practically perfect Ellie Preston is out to get her, and Principal Wible wants to send her to remedial summer school to work on her powers! It's enough to make a girl want to disappear...if only she were a Friday.