Julia is dismayed to learn that Coach Marissa has to leave the Vipers swim team for an urgent family matter. Coach Nathan, their new temporary coach, is strict and humorless. He doesn't even let them have Splash Time! And it's not just Julia who's upset -- two of her teammates have even quit the team. So it's no surprise that the team is not enthusiastic when Coach Nathan asks them to put together a car wash fundraiser for the team.

But then they learn that there's going to be a big increase in pool rental fees, which means the Vipers may lose practice days, or worse, not be able to swim at all. Julia takes the lead and gets the Vipers organized. Along the way, she learns more about her nemesis, teammate Olivia, and even Coach Nathan. Maybe first impressions aren't always the most accurate.