As Molly swam through the shipwreck, she caught sight of a pair of red eyes glowing through the murky water ahead.

“Delphi,” Molly hissed, her voice coming out shaky and frightened. “Delphi, look! I think the Dark Queen’s killer whale has come back for us again!”Delphi flicked her head around to see and a look of terror crossed her face.

“That’s no killer whale,” she said. “It’s a shark, Molly. It’s a great white shark!”