Roseanna M White concludes her Codebreakers series with A Portrait of Loyalty.  In the midst of World War I, the Bolsheviks revolted against the Czar of Russia, creating even more havoc in the world.  Lily Blackwell is a photographer with the Intelligence Division of the Navy.  It is through this work that she meets Zivon Marin, a linguist and cryptographer refugee from Russia.  

Zivon works hard at the job he's been given and has shown nothing but loyalty to the British Crown as well as to the Czar.  His brother, Evgeny, is a Bolshevik through and through and he does everything he can to destroy his brother's reputation. Regardless of Evgeny's actions, Zivon loves him and doesn't want any harm to come to him. 

Worked into the plot of this book is the influenza pandemic of 1918.  Lily works at the hospital in the Vocational Aid Detachment and encounters the influenza up close and personally, when her sister dies from the disease.  

While Lily's and Zivon's relationship is foremost in the novel, the historical aspects of the book are well researched and delineated.  Roseanna has created characters that are both likable and believable.  The settings are incredibly descriptive and allow the readers to feel they are part of the book.  It is easy to get lost in the narrative and not come out until the book is finished.  This is a five-star book, with two thumbs up, and a garden party to help a friend.

Bethany House and NetGalley.com provided the copy I read for this review.  All opinions expressed are my own.