A young girl named Elisa discovers a long-lost, strangely polite lizard living in her bathroom faucet. Through a humorous and whimsical dialogue, Elisa and her mother debate the possibility of a lizard living in human spaces. The lizard seeks food and a safe home, while Elisa resists him, fearing contamination and the mess of insects. After a series of misunderstandings and playful conversations, the lizard chooses to leave and eventually forms a friendly parting with Elisa, who learns a gentle lesson about kindness and curiosity. The tale blends fantasy and domestic setting in a child-friendly, light-hearted fashion.