Labyrinths, locksmiths and libraries hold the key to unravelling the mysteries of the House of Strangeways, a Gothic mystery.

Who is Daedelus Stryke, the master of the house, who occasionally disappears without ever leaving the grounds?

Who is the woman in the walls? And why can you hear her voice?

And what is the story of the locksmith who could open any door...except the one to his wife's heart?

Mrs Poppletoff has just unlocked my door.

I kept perfectly still as she entered, touching my belongings lightly as though she might find this book. But ever since I discovered Mr Mumm going through my things, I have kept my journal on my person - sleeping or awake - at all times.

She has just left; I hear her keys jangling down the hall. I shall not follow her...but I will find the key that Peregrin lost. And maybe, find his woman in the walls.