Pod, Homily, and Arrietty Clock -- the miniature Borrowers -- depend for their livelihood on the "human beans" whose cottage they live in. So when they discover that their humans are moving away, the Borrowers are forced to find a new home and a new family to borrow from. With the help of the wild Borrower boy Spiller, they make a harrowing journey down the cottage drain in a soap dish and are soon living in a teakettle by a river. But the poor Borrowers...

Life is returning to normal for Denizen Hardwick. Well, the new normal, where he has to battle monsters in quiet Dublin bookshops and constantly struggle to contain the new powers he has been given by Mercy, the daughter of the Endless King. But Denizen may need those powers sooner than he thinks - not only are the Tenebrous stirring again but the Order of the Borrowed Dark face a new threat from much closer to home...