I'm trying to find a science-fiction novel that I read in what would have been the late-90's or early-2000's. The basic plot of a novel was that the main characters were investigating a murder that took place on a colony that was hovering above a super-massive planet. A couple things that stand-out though in my memory:
- The male character was a native Australian from Earth
- They had had their heart replaced with a mechanical one
- There was a side plot involving an alien artifact that had been found
- The murder was originally found near a pendulum in a park
Also, the conclusion might help as well:
The planet was coming out of a "winter cycle" and planet life was returning. This was being covered up since its discovery would have meant that the colony would have to leave.