The Cogheart Adventures

When 13-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.

When escapologist Jack Door breaks out from Pentonville Prison, he sets out for the town of Brackenbridge, determined to find his missing treasure, the Moonlocket. But when Lily and Robert unwittingly find themselves caught up in Jack's search, they discover that Robert's history holds the secret to the Moonlocket's whereabouts. Determined to solve the mystery, Lily, Robert and Malkin the mechanical fox set out for London on an adventure full of danger, family secrets and long-buried treasure.