When thirteen-year-old Lily's inventor father vanishes on a routine Zeppelin flight, Lily's determined to find out the truth behind his disappearance. But she's not the only one searching for her father; there are silver-eyed men in the shadows who will stop at nothing to find him. With Robert, the local clockmaker's son, Lily travels to London, where they soon discover that she holds the key to the mystery...a mystery closer to Lily's heart than she could have ever imagined.

Violet never wanted to move to Perfect. Who wants to live in a town where everyone has to wear glasses to stop them going blind? And who wants to be tidy and perfectly behaved all the time? Violet quickly discovers there's something weird going on - her mam is acting strange and her dad has disappeared. When she meets Boy she realises that her dad is not the only person to have vanished... and that the mysterious Watchers are guarding a creepy secret!