Ash battles someone all too familiar, and later hears a message from the Necronomicon. Meanwhile, the deadliest Deadite attacks.

The townsfolk celebrate the New Year, which allows Jack and Elizabeth to make a fresh start. Meanwhile, Rosemary and Lee have a new adventure and Pastor Hogan runs into an unwelcome visitor from his past.

Leo must put his faith in his friends and in himself to have a chance to defeat the Turks.

Steven's trial is over, but a new one is just beginning. Will the jury find the suspect's confession or his conflicting statements more believable?.

Olalla wakes in the Jezequiel house to discover that Robert has taken her there to lie low. Unbeknown to him the spectral creature that escaped at the end of episode 5 has been stalking the house. It is a Siren, able to take the form of the beloved to anyone who looks at it. It is also driven by the need to suck the life out of its victims with a kiss. Olalla quickly senses something amiss in the house and she's right. The Siren knows they are there and sees them as fresh prey.

MIO lead a failed raid on Jekyll's to capture Robert and Olalla, but of course they're not there. Lily fares no better when she tries to wheedle the information of their whereabouts out of Garson.

Robert shares the news of his proposal with Maggie but Maggie is unimpressed. She is certain that Robert cannot keep the lid on his Hyde side. Olalla agrees and Robert argues with them. Alone and brooding he discovers Lily has arrived... but it isn't Lily. It's the Siren. Robert is mesmerized as 'she' tells him she knows all his secrets - but will he kiss her?

Tenebrae soon pick up the Siren's energy on their radar and Fedora is tasked with tracking it down. Legend has it that the Siren is powerful enough to release the dark power of Lord Trash and free him from beyond the seal where he is trapped. Reviving Dance is no longer Tenebrae's priority.

Still unaware of the Siren, Robert tasks Ravi with finding Dance, using the vestiges of his psychic parasite-vision. Inadvertently Ravi sees Renata conversing with the Siren and the team race to save her before she is killed by a kiss. The Siren escapes and Robert pursues... only to find Lily again. This time they kiss with unexpected consequences.

Now it is Renata's turn to confess. She has allowed this thing to escape from the Temple through the ancestral portal she is tasked with guarding. The Siren seduced her by taking the form of her dead husband. Now she knows she must make amends. The team also learns that the Siren must reach full strength before it can break the seal for Lord Trash. During this time it is vulnerable and they resolve to destroy it.

Robert is travelling back to London with Maggie and Ravi when Fedora ambushes them on the road. Fedora's goal is to retrieve the Incubus and she does so at gun-point with the aid of a supernatural extraction box. Garson and Bella turn up to rescue their friends but Fedora makes her escape.

Robert now knows that Tenebrae have the demon - and that can only mean a final reckoning. Before that happens he resolves to make a clean breast of everything to Lily.

At Lily's house, Robert can find no sign of her but he does find Hannigan from MIO. It infuriates him. He explores the house, searching for Lily and discovers Bulstrode, Lily and Sir Marian Carew together. The shock flips him into Hyde and the scales fall from his eyes as he realizes Lily has been an MIO spy all along. Sackler knocks him out with a monocane dart before Hyde can do any damage.

Meanwhile, Fedora resuscitates Dance by channelling the Incubus into his rotting body. Dance is completely rejuvenated - and then horrified to discover the demon's power has been wasted on him. Fedora persuades Dance it is a win-win outcome: he is alive and he holds the Incubus' power inside him. Now Dance can open the stone Calyx, containing Lord Trash's heart, by himself. All they have to do is retrieve it from MIO HQ. Then they can resurrect the apocalyptic Lord Trash...

At the Jezequiel house Renata finds Olalla in the temple trying to decipher the story of the battle book. Renata is dying and Olalla has realized the importance of the portal. When Olalla offers to become the Jezequiel guardian, Renata feels able to share her last secret. If Robert finds the Calyx first there is one way he can thwart Dance...

Robert wakes in his Jekyll guise and forms an uneasy truce with Lily. The urgency of facing a common enemy binds them together and they head for the Jekyll house, intending to use Ravi's power to track down Dance. At home Robert receives a crucial phone call from Olalla, giving him the information he needs to destroy the contents of the Calyx.

The Cutter and Silas' men launch a surprise attack on MIO. They release the captured monsters from the cells, and trap the MIO troops and staff in the basement while they steal the Calyx. A major battle ensues, while the Calyx is hastened away to Captain Dance. Fedora and Dance then launch their attack on the Jekyll house, trapping Robert and his team inside. Dance opens the Calyx, holding everyone except Hyde in suspended animation as Lord Trash's heart starts to beat. Only Hyde is able to force his way through the Calyx's paralyzing power and he plunges his hand into the stone jar - unleashing a devastating explosion... Who lives? Who dies?.

Bucket pays a visit to his old enemy Fagin, convinced the criminal had a part to play in the murder of Jacob Marley. The encounter sets him on the trail of Fagin's old partner in crime Bill Sikes, whose wooden cosh could provide the vital clue that will solve the case. Meanwhile, Frances comes up with an idea to ruin her sister's plans.

The Havishams throw a New Year's party. Amelia is delighted to be reunited with her brother Arthur, but is troubled when an unexpected guest joins the celebrations. Meanwhile, Frances Barbary rekindles an old friendship and allows herself to hope that it may develop into something more.

As the sun rises and sets on the island and its solitary mansion, the number of guests is whittled down by their invisible enemy - to seven, to six, to five.