The Puppet Maker's Bones (Death's Order, #1)
Loneliness can drive a normal man to madness, and Pavel Trusnik is not a normal man. After committing a crime that leaves him shunned and isolated, Pavel has only the fading memories of his tragically flawed life, and his one great love. When a violent sociopath sets his murderous desires upon Pavel, only an ancient order that knows Pavel's secrets can intervene. But for the isolated old man, the vicious intruder is the only company he has had in decades...