The year is 1938.
"In London, Frederick Troy, newly promoted to the prestigious Murder Squad at Scotland Yard, is put in charge of rounding up a list of German and Italian "enemy aliens" that also includes Frederick's brother, Rod, who learns upon receiving an internment letter that despite having grown up in England he is actually Austrian.
Hundreds of men are herded by train to a neglected camp on the Isle of Man.
And, as the bombs start falling on London, a murdered rabbi is found, then another, and another. Amidst great war, murder is what matters."