New Arrival, Red Cat, by Peter Spiegelman

Just in is the new novel by Peter Spiegelman, Red Cat. This is his third book featuring Manhattan private investigator John March. March has been considered the black sheep of his family since deciding not to join the family's investment firm. He is surprised when his married brother, David, comes to him for help in tracking down a woman who is blackmailing him about an affair. When that woman later turns up dead, David is the prime suspect in her murder. Will John save him, or be the one who puts him away?

You can learn more about Peter Spiegelman at his website.