In Day of Doom, the legendary struggle between the Cahill family and the menacing Vespers finally comes to a head. A virtuoso performance from theater and voice actor David Pittu enhances the action, drama, and emotion as brave Cahill siblings Amy and Dan figure out Vesper One's terrifying endgame. It's up to Amy and Dan to stop the Vespers - or watch the world come to an end. Fast-paced and thrilling, the startling conclusion to this popular series is a must-listen.