(Paperback)

When 13-year-old Lily's inventor father vanishes after a Zeppelin crash, Lily's determined to hunt down the truth behind his disappearance, helped by Robert, the local clockmaker's son, and her wily mechanical fox Malkin. But shadowy figures are closing in and treachery lurks among the smoky spires of London - along with a life-changing secret.

(Paperback)

When infamous 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 Door's search, they discover that Robert's history holds the secret to the Moonlocket's whereabouts...

(Paperback)

Swept into the hustle and bustle of New York, Lily, Robert and Malkin discover shadowy secrets lie beneath its surface. For there are chilling goings-on in their hotel... A boy held captive, haunted by an undersea mystery; and a revengeful villain with a treacherous plan. Can Robert and Lily reveal the deadly truth before the secrets submerge them

(Paperback)

When a travelling skycircus arrives in Brackenbridge, Lily and Robert can't wait to step aboard... But there's something sinister about the hybrid children who appear as part of the act. And before Lily and Robert can do anything, they're captured by shadowy figures and whisked off in the mysterious flying circus to somewhere far, far away...