1
general::
Phrase(s): fall in(to) place
to fit together; to become organized; to make sense. • After we heard the whole story, things began to fall in place. • When you get older, the different parts of your life begin to fall into place.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, fall into place. Fit well; also, become organized. For example, With the last witness's testimony, the entire sequence of events fell in place, or When the architect's plans were complete, the construction schedule fell into place. This idiom uses place in the sense of "proper position," a usage dating from the mid-1500s.
American Heritage Idioms