Diana’s pregnancy advances, raising concerns about her ability to travel safely. Meanwhile, the research team makes progress in analyzing the blood-rage gene. Baldwin contacts Diana and Matthew, cautioning them about Richard Bellingham, another vampire in the lab. Matthew heads to the lab while Diana and Lucy continue researching the Voynich manuscript in the library.

Later, Diana receives a call from Matthew, prompting her and Lucy to rush to the lab. The research team identifies irregularities with the Ashmole 782 page, which fluctuates in weight. This discovery indicates that Ashmole 782 is a magical container. As Lucy examines the page, Chris expresses frustration about the lack of DNA data for blood-rage research.

Miriam proposes sending Marcus to New Orleans to collect samples from his offspring and their descendants. Chris becomes angry at Matthew for concealing this information. Gallowglass and Miriam suggest alternative sources for DNA data. Subsequently, Diana and Lucy encounter research obstacles in the library.

Diana and Gallowglass encounter a vampire blocking their path, who turns out to be Jack Blackfriars, a child Diana cared for in 1591. Diana is thrilled to see him, but Matthew, initially too far away to recognize Jack, perceives him as a threat. Matthew rushes toward Jack, prompting Jack to shift into blood rage to protect Diana.