Mrs. Sweetly was the meanest teacher in the Harriet Tubman School. Oh, and did I also mention she was going to be my third -- grade teacher?! After the first day of school, I knew I had to have a Secret Plan: To Get Mean Old Mrs. Sweetly to Like Me! That's when I decided to be very helpful and volunteer for everything. So when I, Willimena Thomas, sweetly volunteered to take care of Lester, our class guinea pig, I had no idea it would begin the worst weekend of my life...