11-year-old budding scientist Demelza Clock discovers that she inherited the family ability to summon ghosts, which may come in useful when Demelza's grandmother is kidnapped and only demelza can help.
Demelza loves science - she loves it so much that she's been known to stay up late to work on her peculiar inventions! But Demelza discovers she has inherited a distinctly un-scientific set of skills: Spectre Detecting.
Like her grandmother, she can summon the ghosts of the dead. But when Grandma is kidnapped by a mysterious villain, she knows Spectre Detecting has something to do with it. Only Demelza and her pasty best friend, Percy, can solve the deadly mystery ...