Controversial opinion, this didn't grab me as thoroughly as it could have off the rip. Butcher&Blackbird, for example, had me in the first 5 minutes but it took a little longer for me to warm up to Lights Out. I don't go for the mask thing, maybe that's why. The anticipation and build up to Josh removing the mask in front of Aly was on point though! No spoilers on when that happened but it turned out to be kind of funny too. 
I actually thought this book balanced the spice with the plot extremely well, it may be partly due to the fact that the spice was part of the original plot but the secondary plot with Aly's job and her family was great. I'm pretty impressed with the depth of the character development with both Aly and Josh's back stories being both ridiculous and plausible for creating two compassionate yet damaged individuals that are perfect for each other.