From the outside, 5 Brocklehurst Grove looks like an ordinary house - the windows are always clean, and the garden well tended. And from the inside, to hear the voices of the inhabitants, the Mennym family, you would think they were a perfectly ordinary family, too. But you'd be wrong, for the Mennyms are far from ordinary. The whole family shares an astonishing secret behind which it's hidden for forty years; a secret to which nobody has ever come close - until perhaps, now. When a letter arrives from Australia, the whole family is plunged into fear that, for the first time, their secret is about to be exposed . . .