Henry and the Guardians of the Lost

The yellow letter arrived on a Saturday, otherwise Henry would have been at school. The envelope was such a bright, sunny colour, no one would have believed that it contained a bombshell. Less than 10 minutes after the arrival of the mysterious letter, Henry is on the run with his Auntie Pearl, possibly never to return home. Henry has a secret. He is twelve, but he hasn't aged a day since the moment he was thrust a hundred years into the future....