Jonathan Stroud built such a robust, engaging world with Lockwood and Co. It can be eerie, unsettling, and dangerous, where the dead stalk the night and range from being just an uncomfortable nuisance to full on murderous. Having only children being able to see ghosts gives our main characters a good amount of power and agency in the story, though Stroud is good about not painting all adults as pathetically useless. I was a bit confused a bit as to when this story takes place, as it has a sort of timeless quality, but does mention a few modern things here and there. It kind of falls in the same place as A Series of Unfortunate Events at times, where the time period is generally whatever it wants to be. 

The writing is effectively creepy at points, giving a good introduction to horror to younger readers looking for a bit of chill. I don't think it's too much for a middle schooler, but that's coming from an adult that was watching things at that time that they probably shouldn't have. Still, it's a great ghost story that leads our characters into pretty precarious situations.

As always, what would a middle grade fantasy series be without a core trio. I liked Lucy's clear, empathetic voice as she narrates the story, with the charismatic Lockwood and persnickety George at her side. There's a bit of casual fatphobia with the way George is described at times, which is a bit of a downside. They bounce off another fairly well, though, and at least have a entertaining dynamic.

Will probably be checking out the sequel at some point or another. I don't think it's one I would pick up immediately, but after letting this one sit a bit I'd get on it.