Outbreak (The 39 Clues: Superspecial)

Join the Cahills in a thrilling 39 Clues Superspecial adventure as they investigate the mysterious return of Sinead Starling, a former ally turned traitor. Young leader Dan Cahill must uncover whether Sinead is part of a dangerous plot to control a deadly virus or if she's become a hero in her own right. Set against a backdrop that stretches from Cuba to the Bermuda Triangle, this gripping tale challenges the Cahills' trust and puts the fate of the world at stake.