Whale Shark Jack follows Sarah’s journey as she tries to recover from an unexpected tragedy and finds herself in the coastal town of Exmouth, WA. She struggles to make new friends and find her feet on land,and even in the comfort of being back with her great-aunt Dot (played by Rachel Ward), she is desperate to return to her old life at sea. Sarah pegs all her hopes on Jack, certain that when his migration brings him back to Exmouth, her mother will take her out on the boat again. But when Jack fails to return, Sarah embarks on a risky mission to find him.