As JB said, everything turned out so perfectly. This is definitely my second favorite book in the series, and it’s interesting to think how much the characters have learned through eight books. I also enjoyed the symbolism at the end, how JB thinks that time travel could be made safe again after a while. Jordan definitely had a lot of character development, and even Jonah seemed to be less whiny than at the start. Really enjoyable series, recommend for ages 9-13 or so. Not any younger than 9 because it might be a bit confusing and complicated.
TL;DR: I'm sad that it's over but glad that it happened