Robert B. Parker's Buzz Kill

"After a near-death experience, Sunny Randall is ready to lighten her load as a PI--that is, until she is called upon by billionaire media magnate Bill Welch to investigate the disappearance of his son Dylan, the cofounder of the Gonzo Energy Drink company. Lazy, unscrupulous, and a notorious partier, Dylan isn't exactly reliable. But Dylan's mother Lydia insists this time is different. She knows him. He's her son. And she believes he's in serious danger. Unable to turn down the Welches' life-changing offer, Sunny takes on the case, starting off by befriending Dylan's smart young business partner Sky, who seems like his polar opposite. Sky is bright, innovative, ambitious, and empathetic-- yet surprisingly, she adores Dylan, and desperately wants Sunny to find him"--