The Mystery of the English Castle. Part 3

Intricate mazes, magical transformations, a journey into the past, and missing children...
The Thompsons could not even imagine the adventures that awaited them with the purchase of an ancient English castle.
This time, Stefania teams up with a gang of criminals to... find an ancient blue crystal. She needed all the knowledge gleaned from books about Sherlock Holmes to organize the investigation and unravel a case that even the local police could not handle. The crystal is found, but is it too late?
 
• For puzzle lovers and mystery solvers.
• A twisted plot that keeps you in suspense until the very end.
• Interesting descriptions of scientific experiments with magical mirrors and crystals, historical notes about Canada in the 18th century.
 
The third book in the series.