I have a long association with SHATTER going back to the mid 1970s when it was one of those films that instead of going straight to DVD, went straight to cable. In the early days of HBO where it was known as CALL HIM MR SHATTER, the movie was a late night fixture airing after more respectable viewers had gone to bed. I remember thinking at the time what an oddball cinematic exercise it was to mix a film noir plot (doublecrossed hit man seeks revenge) with martial arts (or kung-fu as Americans used to say) activity.
And what were stalwarts Peter Cushing and Anton Diffring doing in this East-West hodgepodge? Surely this wasn't a Hammer production? Indeed it was. In fact it was Cushing's last role for the company where he had been a mainstay since starring in CURSE OF FRANKENSTEIN 17 years earlier and he makes the most of his brief appearances as an amoral police official.
SHATTER was the second and last collaboration of Hammer with Hong Kong's Shaw Brothers after the notorious but hard to dislike LEGEND OF THE 7 GOLDEN VAMPIRES. Both movies were made in 1974 and while LEGEND proceeded fairly smoothly and wound up making money, SHATTER was a troubled production and didn't recoup its meager budget which is why it went to cable so fast.
Cult American director Monte Hellman (TWO LANE BLACKTOP) started the film but was replaced halfway through after complaining about nearly everything (just listen to his commentary). Michael Carreras found himself directing another film where the director was unable to complete his assignment. World weary Stuart Whitman looks as if he'd rather be anywhere else but at least it's not THE MONSTER CLUB or DEMONOID. Not a good movie but it's not without some merit. The ending sums SHATTER up perfectly. For true Hammer aficionados only.