It was impossible not to be afraid in such a sea, but somehow it was exhilarating too. Layla clung to the mast and held her breath as they went sliding down towards the bottom of the sea, only to miraculously rise and do it all over again.

A great wave suddenly hit them and poured over the deck. Casper lost his footing and went crashing against the side, the wheel flying from his hands. It spun round as fast as a roulette wheel. The ship yawed, yawning and turning. Layla made a grab at it and got a bang on the shoulder before she managed to catch hold of one...