Let's be clear: Seeds of Time is not a bad book. It's just an okay book.
Honestly, it has a lot of potential. Unlike ever U.S.-centric novel, this book is set in Canada at a summer school. Our protagonist is a disabled girl who is very honest about how her prosthetic foot affects her life. Neatest of all is that this story involves time travel to medieval Scotland!
However, overall the writing is lackluster. The pacing is very fast, considering it spans an entire summer, there is no subtlety to the themes of the story. It's clear that Darrell is intended to have a character arc and that the story is anti-ableism and anti-racism (all good things!), but it's so obvious and blatantly told to the reader instead of being shown that it loses its nuance. If delivered with a less obvious touch, all of this could have been impactful, but unfortunately it falls flat here.
Darrell is not a really likeable protagonist. Her downer attitude is on purpose to set up an emotional arc, but it also makes it really hard to connect with her as a reader. Even after her redemption, I was struggling to understand her as a character. Her friends are also fairly one-dimensional characters, and it's hard to understand why they put in effort to try to befriend her.
The Scotland plot was interesting from a historical detail angle, but it came in a bit too late for me to care too deeply.
Seeds of Time isn't the most stellar novel in the world, but if you're looking for a quick novel and have a keen interest in medieval Scotland, this might be a good read for you.