Amid a devastating family emergency, Luke finds the lines of his double life becoming blurry as he deals with a distracted Emma and a demanding Boro.

It's a sink-or-swim mission when Luke and the team dive into deadly waters to stop a sinister terrorist from making a massive splash.

A face from the past threatens Luke and Tally's recharged romance. The team breaches a fortified compound to keep vital intel out of enemy hands.

As Greta attempts to loosen Luke's lips, the safe-house gang gets an earful from afar. Emma turns heads on the dance floor with an unlikely date.

While Cress tightens the screws, Chips matches wits with an interrogation expert. A stealth mission makes a bigger bang than expected.

Emma and Luke catch a buzz in a deep-sea submersible. Back on land, bullets and breadsticks fly in a confrontation at a pizza joint.

Every second counts as the team scrambles by land, air and sea to avert a catastrophe. Aldon finds himself outnumbered — but not outmatched.