But if she didn't, Dr. Thorne had said the timeline would collapse.

The jufd code was her mother’s handwriting, a cipher left in an old suitcase with a handful of postcards and a faded photograph. Mara’s mother had disappeared on a morning that smelled of boiled coffee and promises; only the code remained. The numbers were not just a timestamp but a ransom note to reality: a lock, a location, a duration. 022521 min defined the window to reverse the rewire.

It appears to be either: