Moments later it hit the town. Boats that had been beached on the floor of the harbour were now thrown roof-high, tossed up and dropped down again. The first wave hit the quayside wall and crashed upwards like an eruption, and then, terrifyingly, beyond reason, flowed on, out of its bounds, rushing past houses, up alleyways, towards the market square where no sea had ever been. The quayside disappeared at once underwater, the panes of the windows of the inn smashing in a fusilade, as the waves breached the walls and poured inside the inn and into all the quayside houses. In Ishraq and Isolde’s bedroom the two girls flinched back as the windows popped like paper and the water poured in; they were waist deep in seconds and yet the wave still came on, the water still rose.

‘This way,’ Luca yelled beside them. He kicked out the frame of the window. Wood and the remaining horn panes of the window whirled away as the sea thrust him backwards. Soon the water in the room was up to their shoulders, Ishraq and Isolde off their feet, and flailing in the icy seawater as they gripped each other’s hands, bobbing in the turbulence as the waves crashed into the little room and washed out again.

Luca swam towards Isolde, the current pushing them deeper into the room and away from the safety of the open window. ‘Take a breath!’ he shouted, and with his arm around her shoulders, he dragged her under the water as if he would drown her. She slipped from his grip and went like an eel through the broken aperture to the raging water outside. He bobbed up and saw Brother Peter supporting Ishraq, both of them, faces raised to the ceiling of the room, mouths upturned, snatching at the last inches of air.

‘We have to get out of the window!’ he shouted. He gulped air, grabbed at Ishraq and thrust her deep down into the water of the room. He felt her struggle and then turn towards him and he pushed her clumsily towards the open window and swam behind her, forcing her on. A hand on his foot told him that Peter was following them.

Luca had his eyes open underwater, though all he could see was a swirl of grey and all he could hear was the terrible roar of the wave as it reclaimed the land. But then he saw that the faint square of the window was blocked, and he realised that Ishraq was not through, she was caught.