El ataque de los piojos (Perrock Holmes, 11)

The Mystery Club detectives have a new case: a massive lice infestation is sweeping through the city. Where did all these critters come from? Here are the facts: Everyone is itchy—on their head, eyebrows, arm hair... even under their armpits! Here are the clues: YTNOM, the name of the company that makes the lice shampoo, is hiding a secret... There's definitely something mysterious going on here... or is there?