Sadie is an ornery girl who is always getting in trouble for hitting her sister, sneaking candy from the cabinet and even the keys to the car! Although her mommy does her best to teach Sadie right from wrong, it seems nothing is working to help Sadie be good.

Sadie's older sister has been keeping so many secrets of bad behavior from their mother. But when Sadie hits her one time too many, the sister tells their mother everything. Sadie is about to discover that there are consequences for every mischievous choice.

The Sister Who Snuck is the tale of two sisters after one goes too far with her naughty behavior and forces the other to spill the beans to their mother.