In this third adventure, Agatha's mother gives the children twotickets to the cinema. Alfred is excited and really enjoys the show.Leaving the cinema the children meet a distinguished gentleman, noneother than Thomas Alva Edison, inventor and businessman who invitesthem to visit his factory. However, this was more than a chancemeeting, and the businessman has an ulterior motive for inviting them. When they get back home, Agatha discovers that her uncle has sent amysterious package, a box that they're forbidden from opening. Withinstructions to deliver the parcel to a messenger, the mystery begins.
