Black Obsidian

Andrew and Julian Keller are two young New York lawyers, cousins, one with his head on his shoulders, dedicated to work and intent on building a family, the other more inclined to satisfy his own desires and to drown in the vices that to spend his time closed inside four aseptic walls.
Marlene Evans will upset the existence of both in a game of love and obsession with unpredictable consequences.

- From the text -

Julian hated Andrew and Andrew hated Julian, everyone knew that. They knew their respective families, their fathers - from whom they had inherited the study they now ran together - and the paternal grandfather to whom both were very attached; she knew Daisy, Andrew's younger sister, who escaped after only ten days' stay at Keller & Keller, as her brother's assistant, because she could not hear them screaming. And certainly Rose knew it, the receptionist, and the walls that surrounded them and that, being inanimate, they were forced to stay.