Killing Cousins (New York Mysteries) First edition

A murderer is loose in Manhattan and he's making hotel guests his victims...
When the wives of two billionaire Texans are brutally murdered in New York's swanky Sutherland Hotel, Franklin and Felix Novak and Soraya Navarro need to move fast before the killer strikes again. Hoping to find a suspect, Felix and Soraya check in to the Sutherland, posing as wealthy lovebirds on vacation. Meanwhile Franklin looks into the shady dealings of the hotel's infamous owners, the Apples.
Is somebody trying to get vengeance on the Apples? Or are the Apple cousins, deranged Morris and slick Simon, fighting for power and using guests as ammunition? As Felix and Soraya close in on the killer, their relationship catches fire, while a corpse with a bullet in the belly throws suspicion on the least likely suspect.