Zodiac is a complex police investigation wrapped up in a thriller.

There are moments of extreme heart-stopping fear, followed by long periods of getting nowhere in the investigation.

Is it a great movie? Not for my money - it is too prosaic in places, and the first hour is much better than the second.

It is a good movie? Sure, if you have the time and like the genre.

I went with high expectations given the pedigrees of all involved but was genuinely blanded out by the resulting film.

Disappointing effort that doesn't justify the cast and cost - just not tight enough.