I Didn't Do It - Season 1 Episode 4 Dear High School Self

While Lindy is looking through the mail, she finds a letter she wrote to herself during third grade. Lindy reads her letter and finds out she wished for better friends by the time she gets to high school. When everyone else gets theirs, Lindy hides the letter and tells her friends that she hadn't received it yet. They go looking for it in their old third grade classroom and in the post office, when they realize that Lindy is hiding something. Lindy throws the letter away and the group looks for it in the school's garbage room. When they finally read it, it causes a rift between Lindy and the group.