Deep sea treasure hunting. Supersonic water walking. Swimming with sharks.

Lincoln and Hudson Dupré are brothers with active imaginations. When one of their imaginary adventures leads to the outdoor pool at the recreation center being closed, they're faced with a choice: join the Sharks swim team or miss out on swimming altogether. But Coach Strickler is old-school and runs his team by the rules. Will the boys outwit their coach, make practice fun--and make the team?