VERA ZHURALEVA - September 2020
"The intricate plot, authentic background and accurate details of this story, makes “The Sapphire Stratagem” an enthralling and distinctly different novel from others in the genre.
As with his previous three books, Charles Barker infuses his stories with facts and one can tell that the characters and settings he describes are based on his rich and varied experiences around the world.
Fast paced, well researched and skilfully presented, 'The Sapphire Stratagem' is a page turner you will not be able to put down."
Vera Zhuraleva - Russian history expert and interpreter.