When this film was originally released it was promoted with the notably unimaginative tagline "Dirty Harry is at it again". Whatever this pitch lacks in originality is more than compensated for by it's complete and total accuracy. "Sudden Impact" retains all the aspects that made the previous three Dirty Harry movies so successful- tight pacing, a compelling plot, strong supporting characters, endless gunplay, and bone-dry humor. Some of these elements are not only retained but amplified- this is easily the darkest, bloodiest, and most overtly right-wing installment of the franchise.
The plot is somewhat intriguing: after killing a ridiculous number of hoodlums, Inspector Callahan is sent on a forced "vacation" by his superiors to the sleepy coastal town of San Paolo. He is tasked to investigate the background of a recent homicide victim who was shot in the genitals before being put out of his (no doubt considerable) misery by a second shot to the head. Early on in the film, the audience is made aware of the identity of the killer- an artist named Jennifer Spencer (Sondra Locke) who is hunting down the thugs who gang-raped her and her sister at a fun fair some ten years earlier. This incident is shown in a very disturbing flashback, snippets of which recur before each new murder. As more bodies start to appear with the same M.O, it becomes clear to Harry that both the local police chief and his new love interest (guess who?) know more than they are telling. To make matters even more complicated, the one-time rapists realize who is hunting them and start to hit back hard.
"Sudden Impact" offers relentless action from beginning to end. Clint Eastwood directed this film himself and expertly handles a series of set pieces that culminate in an exhilarating climax. Sondra Locke's performance effectively conveys the blend of ruthlessness and fragility that define her character. That having been said, it is fair to wonder if another actress (who was not Eastwood's off-screen companion at the time) could have brought more charisma and dramatic weight to the role- Theresa Russell and Cybill Shepherd jump to mind as possible candidates. Members of the supporting cast that punch significantly above their weight include Albert Popwell as Harry's partner Horace, Paul Drake as the psychopathic Mick, and the truly scene-stealing Audrie J. Neenan who portrays the vicious Ray Parkins.
However the film has some notable problems- some of the subplots (the animosity between Harry and a gang of twentysomething hoodlums, a Mob vendetta against him) take up too much screen time and don't really have any bearing to the larger story. Their only real use is to raise the body-count to absurd levels. In the first half of the film it sometimes appears that Dirty Harry shoots people more often than he has to use the restroom. However the film moves into top gear as it progresses and the triangulated cat-and-mouse game between Callahan, Spencer, and her former tormentors assumes prominence. This second hour makes it clear that a more stripped-down and slightly refocused screenplay would have given "Sudden Impact" the potential to be a first-class, neo noir-style thriller that could have taken the series to new levels but still have contained more than enough .44 magnum heroics to satisfy the Harry loyalists. Instead we get the film that Eastwood and Warner Bros. clearly wanted to make- a superbly executed but prototypical Eighties action flick that mostly declines to particularly challenge the intelligence of it's intended audience.
This was by far the biggest grossing of the series at the box-office and it is not hard to see why. Though not the film that it could have been, this is still big, trigger-happy fun. Even after repeated viewings, it's going to make your day.

Well, let me start off by saying how utterly HILARIOUS this film is, I simply couldn't keep myself from laughing at the sheer stupidity of it. Don't get me wrong, it IS well acted particularly by Bassinger but the script is just, well the mind boggles truly.
The premise is good and up until Della actually witnesses the murder it is engaging but after that it just goes downhill . Half way through the film the protagonist pulls out her toolbox and of course instead of lobbing it at the guy's head, she decides to pull out a screwdriver, car jack and finally a flare (as in for a sinking ship) respectively to kill her victims.
Then there is the final line that I promise, if it doesn't have you in stitches then I will eat my own left foot.
I would recommend this film to those who simply want to laugh at some good old fashioned, appalling film making. Might I also suggest you watch out for the scene in the scrap yard with the guy falling from the one foot high plank of wood, gets me every time.