Ever since that day Patti had to stay after school, she’s been acting weird. She won’t do anything with her friends. But the excuses she gives aren’t the truth—because Kate, Stephanie, and Lauren have seen her somewhere else! And in the company of a cute older boy. But even a game of Truth or Dare doesn’t force Patti to tell her secret. What is Patti up to? Her Sleepover Friends are determined to find out, even if it means spying on her!