Fiona McClean actually is.An invisible girl is a priceless weapon. Fiona’s own father has been forcing her to do his dirty work for years—everything from spying on people to stealing cars to breaking into bank vaults.After sixteen years, Fiona’s had enough. She and her mother flee to a small town, and for the first time in her life, Fiona feels like a normal life is within reach. But Fiona’s father isn’t giving up that easily.Of course, he should know better than anyone: never underestimate an invisible girl.

    . . .Eleanor Fitt has a lot to worry about.Her brother has gone missing, her family has fallen on hard times, and her mother is determined to marry her off to any rich young man who walks by. But this is nothing compared to what she's just read in the newspaper:The Dead are rising in Philadelphia.And then, in a frightening attack, a zombie delivers a letter to Eleanor . . . from her brother.Whoever is controlling the Dead army has taken her brother as well. If Eleanor is going to find him, she'll have to venture into the lab of the notorious Spirit-Hunters, who protect the city from supernatural forces. But as Eleanor spends more time with the Spirit-Hunters, including the maddeningly stubborn yet handsome Daniel, the situation becomes dire. And now, not only is her reputation on the line, but her very life may hang in the balance.