I borrowed 'The Cold Moon' from a friend and got hooked. Then I found out it was like, the seventh book. I had to go back and read six previous novels to catch up. It was a weird experience, knowing certain characters were safe because I'd met them in the 'future'. It didn't ruin it, but it changed the tension. When a character was in danger in an earlier book, I knew they survived because I'd already seen them later. So if you're someone who hates any kind of spoiler, even the meta-knowledge that a character lives, then you absolutely must read in order. Otherwise, you undercut the suspense the author carefully built.