Stolen Stories - Filthy Henry, #4

People are showing up without any personal memories in their head. They don't know their family, where they are, or even their own name. It is a strange problem, one that those in the medical profession cannot explain. Luckily Ireland happens to have a detective who investigates strange problems that others are unable to explain. Filthy Henry is on the case...or at least he would be if the fairy detective was not missing in action. Meaning Shelly, the fairy detective's closest friend, suddenly has two cases on her plate.
Figure out what is happening to everyone's memories and find where the fairy detective is. A fairy detective who she currently cannot stand.