Almost anything by Stephen Jay Gould is fun and a lot about evolutionary biology. I’d also enthusiastically recommend David Quammen, who is a mix of travel/adventure/outdoors writing and solid biological discussions. Fun and enlightening. Neither one requires advanced knowledge, either, and may inform you.
I’ve found some good stuff just by finding their books in the library and browsing that shelf (can’t remember any particular ones right now). Oh, wait, I remember one about the evolution of limbs, which did a tremendous job of showing how evolutionary change can only work with what’s available in the process of growth and development (i.e. why an extra toe mutation is easy, but a ‘put wings in the middle of your back’ mutation is impossible). (and I’m not just saying that because I knew the guy who discovered tje ‘sonic’ gene, which is heavily mentioned) Arrgg, can’t remember the name, though. If it comes to me I’ll let you know.
Jared Diamond is interesting, though his books tend toward far more speculation and interesting ideas unsupported by real evidence than Gould or Quammen or most serious science writers. There’s nothing wrong with speculation, as long as the reader understands the difference.