How well do you really know your best friend?

Kat Grant and Alice Campbell have a friendship forged in shared confidences and long lunches lubricated by expensive wine. Though they're very different women - the artsy socialite and the struggling suburbanite - they're each other's rocks. But even rocks crumble under pressure. Like when Kat's financier husband, Howard, plunges to his death from the second-floor balcony of their South Florida mansion.

Howard was a jerk, a drunk, a bully, and, police say, a murder victim. The questions begin piling up. Like why Kat has suddenly gone dark: no calls, no texts, and no chance her wealthy family will let Alice see her. Why investigators are looking so hard in Alice's direction. Who stands to get hurt next. And who is the cool liar - the masterful manipulator behind it all.