Missing? Hanna blinked and looked from Aria to Spencer before looking at Alison's empty sleeping bag. How did she know Alison was missing? People didn't just go missing from sleepovers. Maybe Aria had had a bad dream and woke to see Alison not there. Hanna could see how that might alarm her.
"Maybe she's in the bathroom or just got hungry and went for a snack," she suggested, trying to be reasonable. But Aria was so panicked that it made Hanna wonder. Could she be missing?