A relief of a read after the third book which didn’t wow me. This one felt more grounded and the characters were engaging to read. I liked the shift in perspective from third to first person, new to the series. 

I’m growing less amused or patient with the repetitive rule explanations. Reactions from the customers seem more appropriate at this point if it affects their decision to go to the past, as he did in one of the stories in this. But I don’t see why the rules are gone over again and again. I read in one of them that the stories of the first book were originally part of separately published chapters? Maybe? From a magazine or blog or something? So maybe it’s that?