Published
The film that was built to be last
Night at the Museum: Secret of the Tomb was released in December 2014, five years after Battle of the Smithsonian, and unusually for a series entry it was designed as an ending rather than a continuation. The marketing said so directly.
That distinguishes it from most of the tracker. Nearly everything recorded here is a sequel that was expected and did not arrive, or arrived after a long silence. This one is a third film that did exactly what it said it would, on a normal schedule.
Why the ending lands differently than intended
The film was among the last screen appearances of Robin Williams, released a few months after his death in 2014, and one of the final films featuring Mickey Rooney.
A trilogy closer is usually a commercial decision, the point at which a studio judges a premise spent. This one became something else on release. The farewell written into the story arrived alongside a real one nobody had planned for, and the film is now watched partly for that reason.
Is there a fourth film?
Not in this line. The live-action series was constructed to conclude, and it did. The property has since continued in animated form, which the tracker treats as a separate thing: a franchise moving medium is not the fourth instalment of the films people are asking about.
The gap, in context
Five years between the second and third entries is unremarkable — long enough for the cast to have done other work, short enough that nothing needed reviving. It is the kind of interval that generates no search demand at all, which is precisely why most of the entries in this tracker have much longer ones.