Ria and the Revenant - Ria Miller and the Monsters, #0.5

This is a 40-page prequel to Ria's Web of Lies. It does not have to be read in order. A vengeful spirit. A haunted house. A defenseless child. Something about this case is not as it seems. My name is Ria Miller, and I'm from a family of monster hunters. Where other kids my age are worried about crushes and teachers, my parents and I fight trolls, werewolves, and other things that would like to crush their teachers. We take the cases the police wouldn't believe, and we're the ones who keep you alive when the things that go bump in the night get hungry. Take our current case: a man who is being haunted by his wife's very dead, very pissed-off spirit.
So my dad and I have to get rid of the revenant before it decides "till death do us part" is optional. Sounds easy, right? But there's just one catch: the couple has a seven-year-old son, and the ghost is just dying to be reunited with him. And if we don't stop it soon, we'll all be dying, too.