Live Wire by Harlan Coben

Live Wire - Suzze T is pregnant and happy.  But there is a posting on her Facebook page indicating that the baby might not be her husband’s, Lex.  Lex has disappeared and Suzze asks Myron Bolitar to find him. Myron does, in a night club; he also spies his sister-in-law, Kitty.  Myron now must face the lies that tore his family apart 16 years ago and discover why Kitty and his brother Brad kept their distance.  He also discovers the secret that has kept Lex’s rock star partner in hiding.