Commander T’Pol is missing. A survey mission to a Class M planet rich in minerals possibly related to Romulan cloaking technology has gone horribly wrong. Sensor readings are disrupted. When the crew finally locates T’Pol, she’s out of her mind, shooting at everyone—and that phaser isn’t set for stun. To make matters worse, the Romulans are probably lurking out there, waiting to make their move.