Chameleon, The Terror Begins

Kurt the "Chameleon" continues his quest to destroy the Nazis. Nobody suspects him as being the mysterious marksman during the Bavarian Affair. He’s now a man who lives by the law of the gun.
Hitler is summoned to von Hindenburg’s country estate and ordered to either curtail Ernst Röhm and the SA, or he will be sacked as chancellor and replaced by a military panel, Hitler must choose between power and killing a friend…
As the infamous Night of the Long Knives unfurls, Kurt is deep in treason and retribution, as well as dealing with his personal secrets and demons.

From review: "Chameleon is well-paced and keeps the readers on their toes as to what will happen next. Chapter’s end on cliffhangers keeping readers on tenterhooks. The suspense, espionage, plot twists and subterfuge are skillfully implemented, completely entrenching readers in a different, more horrific world. The author’s descriptions of key authority figures within the Nazi regime is nothing short of chilling."