4. Keepers of the House

Complete story — includes the ending

Hope is brought to Vincent to cure her, when he does, she ends up feeling worse. Vincent realizes they need to find the children who have been kidnapped to be sacrificed. Hope warns Klaus not to investigate the blue light. Hayley works with Marcel to find out where the kids have been taken, when they find that a werewolf had begun working with followers of the blue light to take back the city from Marcel, who is despised by the witches and werewolves. She blames the power of the blue light on something related to Hayley and says Marcel will bow to the Hollow too, before killing herself. Freya and Keelin work on finding Marcel's blood and receive a vile of it to kill him. Vincent tracks Will to the sacrificial ritual area and is joined by Klaus, Hayley, Marcel, and Elijah. They all kill the followers of the Hollow, but ultimately realize this was The Hollow's intention. Klaus and Marcel are sent into the Hollow Realm, where Klaus refrains from looking into the blue light, but Marcel does. Marcel finds himself drawn to a blue light before finding the dragon symbol. Hope has a dream where Klaus' eyes turn blue. She wakes up horrified, noting that The Hollow has arrived.