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Hey we have a book cover. Soon there will be an Amazon page. By September there will actually be a book you can buy! #somethingdeeply 
Most of Something Deeply Hidden is about quantum mechanics generally, and Many-Worlds in particular. But the last section uses these ideas in the context of quantum gravity. Thus "Emergence of Spacetime" in the subtitle. #somethingdeeply
Quantum gravity was a big original motivation for Hugh Everett to develop the Many-Worlds approach. When there aren't observers, it's hard to make sense of the Copenhagen interpretation.
These days we have an additional consideration: it's not at all clear what, if anything, we should "quantize" when it comes to gravity. It's better to work directly with a wave function. Many-Worlds is the only version of quantum mechanics that is up to the task. #somethingdeeply
