I've watched the scene several times now, but I just can't seem to figure out how Murph figured out the identity of her Ghost?

The identity of the ghost is a spoiler:

The "ghost" was Cooper, her father.


The screenplay seems to indicate that it was rereading the "STAY" message as an adult that triggered this realization:


Murph (forty) picks up the notebook. Opens it. Finds the word 'STAY' ... looks up at the books, REALIZING ...

And then after cutting back to Cooper in the tesseract sending the "STAY" message to the young Murph, it cuts back to the forty-year-old Murph:


Murph (forty) lowers her notebook, moves to the bookshelves, IN AWE ...

MURPH Dad ... it was you. You were my ghost ...

She is crying. Joyful.

I think it'd be reasonable to conclude it was a sort of "leap of faith" on her part, inspired perhaps by her lifelong grief and her adult sense of how hard it must have been on her father, rather than a conclusion that followed in any completely rational way from the evidence available to her at the time.

  • She also indicates that no-one believed her about the watch and thought that she'd made the whole thing up.
    – Valorum
    Apr 20 '15 at 18:50

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