The Ocean Police are searching everywhere, but when Diane's communicator fails, everyone suspects foul play. Can Dan find her in time? And if Stud and Dan locate the murderous Steele, can they survive a showdown with his evil gang? As the battle continues, Stud discovers that Steele and his sharks have their own reasons for fighting, but Stud's not sure who to believe. Meanwhile, Detective Dan must find the strength and courage to continue his own mission. He grapples with memories of his father and the gift he left behind, and why his dad left in the first place. Stud and Dan must join forces to overcome their own obstacles and save the Ocean Kingdom.