Jasper's latest project is something called a vampire spectrum, which does involve the use of live bats. Olivia wants to support Jasper in any way she can despite not liking bats. However when Sydney Carver, the head of the journal "The Royal Society of Naturalists", comes to Avonlea to support Jasper's work, Olivia is less than excited when she discovers that Sydney is a woman, something that Jasper also didn't known until Sydney's arrival. Because Sydney is in many ways a female version of Jasper, Olivia, who doesn't want to admit it, is jealous of her since she feels that Sydney has more in common with her husband. The townsfolk are also gossiping about Sydney in the same vein. Meanwhile, Felix suspects that Jasper may be a vampire himself. His suspicions are strengthened with Sydney's arrival, Felix thinking she too is a vampire. Felix and Sara believe Sydney the head vampiress, who they need to get out of Avonlea to save Jasper.