By accident (I think) they made a strange little time-slip adapting this story.
"Yours Truly, Jack the Ripper" was published in 1943 (even says so in the first scan); the last murder attributed to Saucy Jack was 1891 (and disputed-- the ones they know for sure were in 1888). The original story kept the roughly 50-year gap, and it was Sir Guy's mother that was killed, not his girlfriend (which makes sense, if he's a passing-middle-aged fellow in 1943). Bumping it up to the then-current 1972, while allowing Kane to draw some nice modish fashions, really makes things weird, unless Sir Guy was implying that his girlfriend's death was a murder that actually should be attributed to the Ripper rather than just a languishing cold case.
I'm picking nits, though; the story's well-laid out and nicely drawn.