'Letters to my Sister' is the second book in the series involving FBI Agent Salonge Dupree and Chicago Detective Anthony Mazur. Following the success of 'Who's the Hangman' they now have to use their individual skills in an undercover sting mission in London, posing as the corrupt husband and wife business owners of a fragrance company. It is an international collaboration to thwart the planned expansion of an Eastern European crime gang into the Uk and then onto US soil. To complicate matters, a multi personality transitioned villain from the first book, 'Who's the Hangman', just happens to to be in London at the same time.
The supposed head of the Dross Dzimta crime gang is Marta Sokalovska. Her family were killed in a plane crash whilst on a drug run for the previous crime lord. She was just seven years old at the time and the only survivor. She was adopted by the head of this organisation and was abused over many years until a soldier of the gang, and admirer of hers, assassinated the old leader and assumed control. Marta has no memory of any of this and believes her family to be alive. She sends letters to her older sister for advice on business decisions as well as private matters, desperately wondering when they shall next meet. Her #1 soldier, the admirer who killed her abuser, supposedly delivers the letters to Riga by hand. However, it is he who is writing the replies, effectively running the organisation himself. When Marta finally discovers that he has been has been lying all these years, and the girl who is masquerading as her sister is an imposter put in place by Alexi, all hell breaks loose.