" Knowing it was her last night on the Arabella, Maia fought against sleep. She must remember it all--the lapping of the water against the side of the boat, the white moths, the fireflies…
Finn, too, was awake. “When we’re grown up I’ll come back for you, I promise. No one can stop us then.”
But she wasn’t grown up and nor was he, and Finn was going on alone. The professor had tried to persuade him to come back with them, but Finn only said, “I promised my father I’d go and find the Xanti. I promised.”
Now, though, lying in the dark, he realized how much he hated the idea of going on by himself. He wasn’t afraid exactly; he knew he could do it--but it suddenly seemed utterly dismal to go on without his friend.
“We could still run away into the forest,” said Maia.
But Finn said no. “Minty really cares about you. The professor told me she nearly went mad when she thought you’d been killed in the fire. You can’t play tricks on her--or on him. They’re good people. It’s just…oh, why can’t grown-ups understand that we might know what is right for us just as well as they do? "

― Eva Ibbotson , Journey to the River Sea