A pseudonym for two journalist brothers, Max Landorff's Tretjak comes for the "Fixer" subgenre of crime fiction.
From the Blurb:
Gabriel Tretjak is the "fixer," hired by rich clients to fix their lives, to challenge fate on their behalf. He does so without moral limitations or scruples. His methods draw on the latest research into the human brain and advances in psychology. His prices are high, but his clients are always willing to pay. No matter how desperate their situation, they want a happy ending; but happy for whom?