The Boy in the Big Black Box — Rebecca Lisle

Wee Willie has been incarcerated in the magic disappearing box by his wicked uncle, but never fear! Joe, Laurie, and Theo gallop to the rescue, resolving the half-cast spell, and rescuing Willie. A new adventure for the three heroes of The Dog in the Diamond Collar, in which their investigative powers and their courage are once more used to great effect!