Pa-dum. Pa-dum. Pa-dum. There's going to be a marching band at the Lincoln School! Drums...fifes...new uniforms...parades! Chrissie Tripp is going to sing right up. She just knows she'll make a great band kid. She's so sure, she tells her new friend, Michelle, she's already in the band.

But then, gonzo! The president of the school, who just happens to be Chrissie's big-mouth sister, Theresa, makes a horrible announcement about the Lincoln Lions Band. If Chrissie doesn't do something fast, she's going to look like a liar--a big liar.