As it turns out, Keira didn't perish all those years ago; she was merely shot in the vascular corridor. Furthermore, she was the reader who forwarded the theory to Rachel. Together, the trio navigates their way off the ship, only for Aidan to blow it up. This act provides Rachel with one last opportunity to envision Argylle, Wyatt, and Keira successfully completing the mission.

It's a joyous conclusion as Rachel, now resuming her identity as Elly Conway, publishes her fifth – and potentially last – Argylle book. Meanwhile, Alfie has uncovered all the shady dealings of the Division, and Keira has blossomed into a formidable tech wizard akin to Steve Jobs.

As Elly is wrapping up a book reading event, she's approached by someone who looks exactly like Argylle (played by Henry Cavill), and he suggests they have a chat.

He remains a mystery for now. We'll have to wait until the next movie to uncover his identity and intentions.