Whose Hellos Are These, Anyway?

You are Alex, a down-on-their-luck private investigator with a penchant for the absurd. One day, you receive a bizarre case: a series of mysterious, unsigned greetings fill the small town of Hellosville, leading people into unexpected chaos. As you unravel the sender's identity, you must navigate through quirky characters, hilarious misunderstandings, and bizarre situations, all while trying to find the truth behind these mysterious greetings. Will you solve the puzzle before someone screams (or runs away in laughter)?