Malorie Blackman

When the mysterious stranger shows up at Nova's parents' hotel, she thinks her luck has changed - until she realizes she's the only one who can see him.
Liam explains he's been here a long time. And he can never leave, no matter how hard he tries.
Soon, Nova begins to piece his tragic story together. But she's hiding a secret of her own - one she's desperate to keep from her family. And now Liam's found her out . . .