Harriet's brothers' band, the Skinks, are hoping to enter a local battle of the bands. Winning could get them on a reality TV show! But low funds have left them without the right equipment. The Startup Squad jumps into action! Harriet, Resa, Didi, and Amelia quickly pull together a plan to rebrand the Skinks and sell T-shirts to raise money. It's a great plan - until everything starts to go wrong.

Turns out tracking T-shirt orders, managing money, and watching inventory aren't easy tasks. The Startup Squad has to focus on each member's strengths, act like a team, and get their business back into the groove. The book also features business tips and a profile of a real-life girl CEO.