Robert cannot understand how he survived the attempt on his life, and follows the advice of new friends Lily and Max to seek answers in his grandfather's house. Meanwhile, his brother Ravi must evade the undead and the colonial police to bring Robert news from Ceylon. Robert tells Max about being attacked in the East End, so Max takes him back to the Empire Hall where Bella and Garson recognise him from the night before.

After Garson tells Robert that his ancestors unleashed their dual identities with a form of medication, Robert is determined to cure himself the same way. Desperate to hide his secret from Lily, Robert tries some old potions from the laboratory. Garson also tells Robert that his grandmother Maggie may still be alive. Max's assistant Hils manages to prise some vital clues from Bella, and Robert and his friends race to find Maggie before Captain Dance's team can kill her.

Wracked with guilt after failing to get to his grandmother Maggie before Captain Dance's men, Robert, Lily and Garson work tirelessly to cure her of sepsis. Garson makes the chance discovery that Hyde's blood has antibiotic properties. Dance and Bulstrode play cat and mouse in their pursuit of Hyde because Dance believes that only Hyde can help him resurrect the demonic Lord Trash. Robert risks everything by turning into Hyde, but will he be able to save Maggie?

Robert visits a distant branch of his family in the country. But, when he and Max learn that a series of murders have occurred in the village - supposedly committed by a legendary demon dog - they suspect the involvement of Tenebrae.

Robert agrees to help the secretive MIO agency investigate a series of monster-related murders in return for Ravi's freedom. However, Robert soon learns that the MIO are not to be trusted.