Vows of Silence (aka True Confessions)

The new minister in town, gives a 'hell-fire-and-brimstone' sermon which convinces the children that the world is coming to an end. The adults have no idea that the children have taken the sermon so seriously. The children go to the lighthouse, prepared to confess their sins, and hope this will save the world. A lunar eclipse convinces them the end is nigh... and Felix's confession almost makes Felicity put an end to him.