As they got closer emergency calls came in from some distant pod, warning them off, urging them to turn back for deeper water. Look out! Don’t do it! It was surprisingly hard to ignore them—he felt like he was the pilot of a falling 747 and the air traffic controllers were begging him to for God’s sake pull up, pull up! But they stayed the course, churning with their tails, pouring on speed, their massive bodies bulling through the water. If they’d had teeth they would have gritted them.

Then Quentin was lying facedown on black stones under a white sky, naked, with the weak surf of the Southern Ocean washing fiery-cold over his bare legs, which were already going numb. It felt like being born must feel, being spat out of the warm, enveloping, sustaining sea and up into the bright searing cold world. In short it sucked.

Quentin did the one thing he knew would feel good: he shut his eyes for the first time in three days and kept them shut for a good minute. He’d missed his eyelids.

Plum was lying next to him. A minute ago he wouldn’t have had to turn his head to look at her, but now he swiveled his small, pale nub of a human head in her direction. She looked back at him, pale and shivering.

“Final leg,” he said thickly.

Huh: lips and teeth. What a concept. He pushed at them clumsily with his tongue.

“Final leg,” she said.

Quentin levered himself up off the shale and immediately fell over. Gravity, my old enemy. What a stupid way to locomote. Standing up felt like trying to balance a telephone pole on one end.

They were on a narrow curving beach, black pebbles and gray sand; it was just about the least tropical beach in the world. They were both naked, and there might have been a time when, as a human male, he was at least notionally interested in the sight of Plum without her clothes on, but he was still mentally more than half cetacean, and the relative nakedness or clothed-ness of a human of either sex really could not have been more beside the point to him. He could barely remember what they were doing here.

Fortunately they’d talked through what would happen next, drilled it into their brains, which they knew would not be functioning at full capacity. They both began searching through the rocks and tide marks, heads down. This had to be done quickly, before hypothermia set in. Quentin reeled like a drunk, cutting his strange, unbearably soft yellow-pink feet on the unsympathetic rocks, until—there. A feather. White flecked with gray. He plucked it out of a mass of sticky, smelly sea-trash. No time to be picky. Basically anything but a penguin would do.