I think I've said this with each consecutive book, but this is my favourite in the series so far!
I'm glad I read 'The Shadow Sister' and 'The Pearl Sister' so close together, because Star and CeCe sort of go hand in hand (though these stories are about then breaking away from each other, growing into two separate people as opposed to a pair).
I mentioned this before, but CeCe really annoyed me in the previous three books. However, as I'd hoped, getting her story made me fall in love with her and I might even go as far to say she is now my favourite sister! CeCe's journey was fantastic. There's a section in Thailand, before she heads to Australia to find out her family history.
I love stories set in the hot, dusty parts of Australia. It's a place I like to visit via books but have no desire to actually go in real life - I don't think I'd handle the heat, the dust or the flies. I really enjoyed following along as CeCe learned more about her heritage, especially the information I got about Aboriginal art. I Googled the artists mentioned and the work was incredible, though I'm sure even more impressive in person rather than a phone screen!
The historical sections feature Kitty McBride, a Scottish clergyman's daughter, who over one hundred years earlier finds herself self in Australia. I loved her and her tragic tale -- and finding out just how she was connected to CeCe.
I find this series gets stronger with each book, as I suppose they all build upon each other, and each one reveals a tiny bit more about Pa Salt -- but I mean a tiny bit. He remains as mysterious and almost mythological as ever.
I'm starting 'The Moon Sister' now, and I'm really looking forward to learning more about Tiggy, who has intrigued me the most of all the sisters.