Hmmm ... I liked this, more so after it wrapped up and I reflect upon it. While I was reading (listening, I went primarily with the audiobook, although I borrowed the Kindle copy as well), especially at the start, I was quite confused and I'm sure I had a scrunched up look on my face. I wasn't really enjoying the first part ...

Basically ... there are three storylines/POVs. First, is Mortimer, he's a cat. Second, is Evan, a young boy (just finishing up elementary school). Both of these perspectives are 3rd person. Then there's Al ... that POV is first person (female narrator). All are past tense. Some of the chapters are short, super short! We/the reader are aware of the storylines crossing ... Al is feeding the cat, Evan sees the cat and the library he is "guarding" ...

There's a Little Free Library ... which I'm sentimental about (I have one myself #182597). 

I pretty much guessed the reveals/twists pretty early on

that Evan's dad was actually the famous author, that he had worked at the library and some had thought he had started the fire. That Al wasn't really a ghost. I had NOT guessed the mice had accidentally started the fire and that the animals had saved Al/Edward.

So, I liked how everything came together, but it was a little (a lot?) choppy and hard to follow at the start. Al DOES say "It will all make sense, soon" in her first chapter, and it did make sense(ish) by the end.   Cute, but ultimately I'm not sure how much I'll remember.