" When Hale's hand disappeared inside his tuxedo jacket, Macey wasn't exactly sure what he'd find inside the pocket. It could have been another phone or a breath mint. Really, nothing would have surprised her. Well nothing except...
"Is that an earbud?" she whispered. He smiled. "Are you on comms?"
"Shhh," he told her softly. "

― Ally Carter , Double Crossed: A Spies and Thieves Story (Gallagher Girls, #5.5; Heist Society, #2.5)