Review of Fingerprints

I get that the conductor likes to torture and kill children and taught his daughter to do the same. But the villain kills older teens and an adult. These are not little kids. Is the killer targeting anyone who sits at the train tracks? Targeting anyone who snoops at the train station? Or just targeting anyone in the main character's life? At the end we find out the conductor's daughter is killing people because the towns folks lynched her father and are now trying to get her father's train station torn down. Wouldn't she be targeting the people who lynched her father or city officials in charge of the demolition? Why not attack little children like she was taught? Or at least the main character for asking too many questions. If she just happens to be a serial killer then she would have a victim profile... like all teens who visit the train tracks. How does the counselor fit into the picture? She never even met the guidance counselor, as far as we know. The killer has no motive for killing these people. If it's just killing people that the main character knows, then why not her mother and father (god knows I was hoping her mother would get it). Or do they have to have visited the tracks first? It's confusing and isn't really made clear.

Also at the end after the main character defeats the villain an entire troop of police cars 'just happen' to show up with sirens blazing. Why were they racing to the train tracks? No one had time or a cell phone to call for help. There were no gun shots to alert them to trouble. Possibly they are looking for the main character who has just fled the police station...however the police seem very polite and helpful saying "how can I help you two ladies?" Not exactly like police sent to arrest someone. Also, the dead boyfriend's truck mysteriously disappears at the end...it was parked in front of her car just 15 minutes before.