Book reacts instantly to that name. "Inara?" Inara's ship? Oh ho, don't let Mal hear you say that...

He tries to track what Yuna is saying, but he quickly gets confused again. "Wait, the Serenity, the other ships were abducted here?" So they are captured. "Where is everyone else on board, then? Captain Reynolds, Zoe, Wash, River?" But Book pauses, and looks at Yuna more seriously.

"Or, more importantly, what has happened to Inara?"