I'm looking for a book I read, almost certainly published in the late 70s or early 80s. It was also most likely directly to paperback.
The story was a dystopian but familiar future in which wealthy people could store memories in a device (a blue crystal, I believe) and also undergo rejuvenation, even from death/near death. The rejuvenation process wiped your memory, so you had to upload from your last save point on the crystal. Anything after was lost.
People used the mechanism mostly to protect against illness or accidental death, and saved at strategic points. However, there was also a form of entertainment in which the very wealthy would pay for renewal for a poor person who needed the process (e.g. illness). The subject would save prior to the session. Sessions were televised or attended as entertainment.
The wealthy person (or their designated actor) would then basically torture the victim to death. One constraint was the torturer was limited to one device with which to inflict pain. When the person was renewed, they of course would have all memories up to the torture point, but not that.
The plot was a basic mystery involving abuse of the system. One other specific point I remembered was there was a popular torturer, and he used a glove filled with needles to torture a woman.
Finally, I recall the paperback cover had a provocative image of a woman and a crystal, all in blue tones (hence my memory of the storage device being a blue crystal). My memory of this may be wrong.
I don't think it was a very good novel, but it was an interesting concept. It was essential torture p0rn a la "Saw" in book form. Reading it in my early two digits was, ahem, provocative. However, I've wanted to reread it as an adult and no amount of Googling seems to come up with anything.
Help is appreciated!