Reddit reviews Kraken : The Curious, Exciting, and Slightly Disturbing Science of Squid

I've been reading this book Kraken. It's about cephalopods mostly so it might be more specific than what you're looking for but it's quite good.

There is also Alien Ocean. Someone recommended it to me and I would like to read it but there is no ebook version so I haven't read it.

If you find anything good let me know would you? I'm interested in this sort of reading as well.