As the girls struggle to make sense of Ian's sudden disappearance on Pretty Little Liars, Spencer (Troian Bellisario) intercepts a startling text message from someone claiming to be Ian, her sister's husband.

"I can't believe this," Emily (Shay Mitchell) says in Tuesday's all-new episode. "Ian is dead."

"No, zombies don't text," Hanna (Ashley Benson) argues. "He is alive somewhere."

Determined to find out what's really going on, Aria (Lucy Hale) begs Spencer to probe her sister Melissa for answers.

"Spencer, you've got to find out what Ian told Melissa," she pleads. "You're the only one who can find out what he wants."

"And where he is," Emily adds chillingly.

Pretty Little Liars airs Tuesday at 8:00 p.m. EST on ABC Family.