Spoiler warning: Spoilers for the full film, including the final body swap.
Beatrice escapes in Nikki’s body, while Shelby returns to her own and leaves Cyrus behind. It’s What’s Inside ends with two very different kinds of freedom: one woman takes somebody else’s life; the other stops reshaping herself to satisfy her boyfriend.
Who is actually inside Forbes?
The guest who brings the machine is Beatrice, occupying her brother Forbes’ body. The real Forbes only turns up afterward, inside hers. That makes the reunion a revenge plot hidden inside a party game.
There are two labels to track throughout: the body everyone sees and the person controlling it. Confusing those labels also causes the apparent contradiction in the deaths.
Who survives the last swap?
| Person | Body at the end |
|---|---|
| Shelby | Shelby |
| Cyrus | Cyrus |
| Beatrice | Nikki |
| Forbes | Beatrice |
| Dennis | Forbes |
| Maya | Brooke |
| Nikki | Reuben |
Reuben and Brooke die while occupying Dennis’ and Maya’s bodies. Dennis and Maya remain alive because their consciousnesses were elsewhere. Neither can return to an original body that no longer survives.
Beatrice leaves with the device and Dennis’ money. The complete swap sequence is also mapped in Netflix’s official cast guide, which distinguishes each round from the final arrangement.
Why does Shelby send Cyrus back to his own body?
Shelby tests the difference between what Cyrus says he wants and what he will accept. When offered a future with her in Nikki’s body, he agrees. For Shelby, that answer makes the problem impossible to dismiss: he wants the relationship on terms that require her replacement.
She returns them both to their original bodies. Because Dennis made a false confession while using Cyrus’ voice and appearance, Cyrus is left facing imprisonment. Shelby refuses to rescue him from that situation.
Her decision is understandable without being morally tidy. Rejecting Cyrus does not make the accusation against him true. The ending gives Shelby agency while leaving a disturbing question about what she does with it.
Beatrice’s escape makes the title sharper, too. Knowing who is inside a body solves the mechanics; it does not tell us who deserves to walk away. Shelby regains her identity, while Beatrice treats identity as something she can keep stealing.
Sources: official ending breakdown; official body-swap guide.
More endings to unpack: The Prestige and Fight Club.