This show ended up far different from how it started.
It's first season was easily the best, with Angie Dickinson chewing the scenery as Sgt. Pepper, and Earl Holliman, well-cast as her boss.
In year 1, she was competent and cool, sexy and tough, the show taut, moody and atmospheric '70s-style, and it hit Number One within seven or eight months of premiering--- it became the first successful TV drama series to feature a woman in the title role. Its early success directly inspired things like "Charlie's Angels", "Wonder Woman", etc., and still later, the more-reality based "Cagney & Lacy".
By season 2, however, Pepper was toned down in every imaginable way: not only her appearance, but the way she spoke, and gazed at her co-stars--- in a pressured attempt to de-sexualize Angie, they wound up weaknening her, curiously enough, and the scripts and direction followed.
As a result, season 2 and 3 are hit-and-miss; and season 4 fails outright.
But season 1 is the show "Police Woman" was intended to be.