"The Royal Prisoner" by Pierre Souvestre and Marcel Allen is a fascinating detective novel that reveals intrigues and secrets at the royal court. In this book, readers will witness the intricate plots, intrigues and conspiracies that surround the royal person. The authors successfully combined the dynamics of the detective genre with the luxury and grandeur of royal intrigues, which makes this book an excellent choice for fans of both a vivid plot and historical details. The Royal Prisoner is an exciting journey into a world of secrets where each character hides their true intentions.