Cardinal Ties - A book in the "Crimson Raven" Series

Crimson Raven - An investigations agency founded on the back of the Tetrinos crime family. A family that was known for their unique tactics, and manipulation of the human mind. Masters of tearing down the emotional barriers and walls of anyone who stood in their way through slow, meticulous practice. They were a family that prided themselves on their use of a silver tongue to get the job done, only taking up arms if absolutely necessary.
  Cardinal Ties follows Kieryn Tetrinos, the last known m,ember of the Tetrinos Family, a private investigator and hunter of supernatural creatures in the low-fantasy, crime-ridden world of Rhenvale as he attempts to found his own investigations agency after his employer, Ambers Investigations, dissolved. Kieryn had left the family behind prior to their explosive demise, opting to use his psychological training to assume the role of an investigator.
  However, the power vacuum that had been developing within the underworld since the family's disappearance has not gone uncontested. Kieryn must deal with the founding of his own agency, while simultaneously trying to deal with the hole left within Rhenvale’s criminal society now that he remains the last living member of the Tetrinos family line.