You decide that this case is more likely to be brought to proper justice if you let Louise handle it. She's been working on exposing the prophets for many years. Plus, she is an adult, who will be more trusted by the police than you would.
So you wait through the day until school finally lets out in the afternoon, at which point you call Louise. She immediately agrees to come to Stenhamra to meet you and before the day is over, you are all sitting together in the backroom of Hål i Öronmask and you tell her everything you found out, from the nature of the Ugliness to Järnek's involvement to his confession about killing Louise's mother when she was threatening to expose them.
Louise takes the information well, noting down what she can. She appears very grim and focused and she promises that she'll continue to build the case, using the information you uncovered, including the names and photos of the prophets, before then making sure they'll all be arrested as soon as the case is watertight.
After this day, normalcy very slowly returns to Stenhamra and to your school. The physical ailments of those affected by the Ugliness take weeks to fully return to normal, so on Saint Lucy's Day, many students are still hiding in baggy clothes and hoodies. The celebration is very solemn compared to previous years.
Järnek doesn't return to work for the rest of the year. He's not hiding, as you see him around town from time to time, but he doesn't appear willing to return to the school. He also hasn't turned himself in to the police but Mia tells you that he has been in contact with Louise, giving her information about the prophets and telling her everything about what they did in the '80s.
Jonas stays away from school for the rest of the year as well. As you check up on him, you find that he is back to normal as well but he seems to be having trouble readjusting to things how they were. His mother tells you that he will be coming back to school in the new year.
Krafta's presence slowly diminishes again in Stenhamra. Their agents stay around the school for a while to observe the symptoms of the Ugliness disappearing but with their experiment failed, they seem to be cutting their losses.
Occasionally, one of you notices a black van parked near your house or by your place of work but you are not approached by any Krafta agents. So far.
Rumors of your involvement in the curing of the Ugliness spread quickly and soon, you find yourselves quite a bit more popular than you were, especially among the elite of the student body who made up a large part of the infected group.
You might not be the coolest kids in school, but you kind of are heroes.
The End