Trouble comes knocking on Paige's front door when a mysterious fire nearly burns down her house. The nature of the attack suggests a firestarter, but the real answer might not be that simple. Are The Charmed Ones about to face another threat from the past or is the culprit a more recent addition to their lives? A secret that Piper's been keeping might hold the answer to more than just Paige's question or it could lead to a whole new set of problems instead.