Weird book. It actually talks about whales for a total of not even 2 pages. The rest of the story is something completely different, and the role of the whales in it could have been taken by cats, dogs, dolphins, or any other mammal who has a voice and makes sounds.
If the purpose was to get kids interested in whales I think the book does a very poor job because the whales are absolutely marginal to the story line, which involves a girl whose mom is in the hospital, and so all the emotions tied to the situation overshadow 100 % the whale topic.
Actually whales don't even show up in the story until after you are half way through the book.
The story line, for what it is, is not bad, it goes fast and it's entertaining, just very sad for a kid's book.
Maybe with a different title it would have made a lot more sense, but like this, whoever buys it thinking it's a story about whales will be for sure disappointed.