Erik is holding Marissa prisoner, trying to negotiate a deal to get him and Hanna safely out of Berlin. Meanwhile Hanna hides out with Dieter and his family. Desperate to know more about what her father is up to, Hanna discovers a huge secret in her own past. As an escape plan begins to form, Marissa attempts to make her own.

Still reeling from her revelations about Erik, Hanna hides out in suburban London with Sophie, who is keeping her new friend secret from her parents. Sophie persuades Hanna to attend a school party where Hanna experiences the thrill of a teenage crush for the first time. Meanwhile, Erik's friends desperately try to save him from the life-threatening injuries he sustained fleeing capture.

Sophie and Hanna's relationship begins to turn sour over their shared interest in Anton. In the fallout from this argument, Marissa arrives at Sophie's house pretending to be Hanna's mother. Hanna finds herself torn between endangering Sophie and her family, or giving up her own freedom and going with Marissa. Meanwhile, a captured Erik is brutally interrogated by Sawyer and his men.

Realising that Hanna will no longer accept anything but the full truth, Erik takes her back to Romania so she can learn more about her past. Meanwhile, Marissa begins to sense that Sawyer has not been telling her the full truth about Utrax.

When Erik reveals to Hanna the truth about Utrax, she is determined to take action. Meanwhile, Marissa attempts to find out from Sawyer what has really been going on at the facility.

As Hanna hides Clara in the vast forests of Northern Romania, the remaining trainees are transferred to an educational facility called The Meadows, where they are assigned new identities. Marissa sets about finding Clara by posing as her mother online, luring her to a hotel in Bucharest, where she is ambushed and captured by Utrax. Hanna follows and is reunited with Marissa.