I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
Honestly, I would read a whole ongoing series just about Spark, who ends up more and more likable as this series concludes.
It ramps up pretty quickly in volume three, and comes to an inevitable, although somehow unforeseen by me, conclusion. I can't see anything that isn't tied up, and Simone continues to push the characters, force them to grow, while coming to her action-adventure/horror conclusion.
Just absolutely lovely.