Planet Harmonia is a fantasy novel set in a world of clowns, mimes, and humans, following a clown named Oliver who seeks purpose beyond slapstick humor, aided by a talkative mime named Benjamin, as they navigate a chaotic world filled with dark comedy and corruption. The book is described as an adventure where laughter and danger intertwine, featuring unconventional heroes in a story that blends dark comedy with a quest for balance and order.