Williams touches on many topics surrounding jellyfish, but that's about it. He rambles on about many things, but never goes more in depth into what he's talking about; it feels very superficial. This, for me, made it hard to keep my attention up.
I will give him that he put a lot of effort into his research, but even so I have the feeling that this book could very well have been a 30 minute video on YouTube. I'm a little disappointed, as I was really looking forward to learn more about jellyfish, but all I got was a very fast-paced mention (not deep-dive, really just a mention) of any topic you could possibly think of might be related to jellyfishes.