The Mystery of the Anonymous Letters. Book 4

The young detectives and their dog companion are back together, ready to solve the most mysterious cases. But alas, everything is quiet in Peterswood, and nothing unusual is happening, except for the unexpected departure of Gladys – Pip and Betsy's maid. The children are sure that things are not as simple as the adults claim, and they turn out to be right. One by one, Peterswood residents start receiving unpleasant anonymous messages. Who is the author of these mysterious letters? This mystery will be unraveled by the five young detectives and their dog companion!