Another strong effort from Abbott. This is a good mystery where the author does a fine job building and maintaining an unsettling, creepy atmosphere. The plot twists are creative but not implausible. The way the community reacts to the sudden seizure epidemic feels very realistic. We're all unfortunately aware of the anti-vax idiots that are so damaging to public health, so it's realistic that some parents would blame a tainted batch of the HPV vaccine. Others fixate on a grody "dead" lake potentially teeming with environmental toxins. In addition to all the intrigue surrounding the source of seizures, the effect of the epidemic on the high school's social ecosystem is also quite interesting.