Oh, Caleb, where art thou?

Quantico's golden boy is MIA. The command center bombing resulted in the death of Caleb's (Graham Rogers) father, and ever since then, the youngest member of the Haas clan has been missing from the New York timeline. Mommy Dearest knows where her son is, but until episode 18 rolls around, Claire (Marcia Cross) is staying mum.

Titled "Soon," the April 17 hour will have Alex (Priyanka Chopra) on the hunt for a slew of missing friends. It seems Caleb won't be the only agent to drop off the grid as the season progresses.

"At Quantico, the NATs look into each other's background to determine who gets high- level security clearance, and in the process Alex, Shelby and Iris learn some surprising truths about Drew, Will and Caleb," ABC teased. "Meanwhile, in the future, Alex contacts Claire Haas in order to find her missing friends and is shocked when she discovers what happened to Caleb."

Does this mean we will get a double whammy of Mark Raymond and Caleb? The NATs alter ego was particularly busy during "Answer," but, aside from confirming his connections to a cult and exposing the truth about Shelby's (Johanna Braddy) patents, Mark's appearance did little to clear up his storyline. However, Quantico may reveal Mark Raymond's true intentions before tackling the Caleb mystery.

"I will say the Mark Raymond story becomes exceptionally clear and everything will be revealed in the next two episodes," executive producer Josh Safran told Entertainment Weekly of episodes 15 and 16 (set to air on April 3).

Check out what's in store for "Clue" (see a preview below):

"At Quantico, the NATS are given a training exercise that hits too close to home for Shelby," ABC teased. "In the future, Alex finds an unlikely ally in Hannah, as she continues to try and stop the terrorist from striking again."

Catch Quantico Sundays at 10 p.m. ET on ABC.

Tags: Quantico television ABC