The Creaky Armor

L'Armatura Cigolante (The Creaky Armor) is an Italian children's book by Cristina Brambilla in the "Misteri A 4 Zampe" series.

Premise
A scary, rusty armor hovers threateningly in an ominous-looking castle. And on a dark and stormy night Mystery Inc. decides to take a break right there. What will happen?