After the tragic conclusion of the previous book, where Sebastian seemingly killed his friend Derek in order to save his identical cousin Nimrod, something which also ended the Leap Year curse, things at 247 Bougainvillea Lane are slightly tense. Magnolia and Sebastian aren’t on speaking terms. Nimrod wishes he could help the two friends reconcile, but grows ever more frustrated with their constant bickering.
Derek isn’t really dead, however, for Sebastian actually killed his foe Zyraba who had body-swapped with Mr Dippy. Derek is alive, stuck in Zyraba’s body, and trapped in Za. The only one who knew this was Magnolia, but her memory of that was wiped during Sebastian’s battle with Zyraba and so Derek is all on his own.
Magnolia feels so guilty for her part in Derek’s “death” that she wants to use the Emerald Eye to create a simulacrum of Derek. Sebastian forbids it, for he has learned that each time Magnolia uses the Gem it shortens her lifespan. But Magnolia does it anyway then also erases Derek’s “death” from all their memories.
The various traumas the team has faced over the past few years takes its toll, and bubbles into one huge argument where Sebastian and Magnolia come to magical blows. It is only Dr Goode who stops their battle turning deadly. He tries to resolve the tension but he too fails. It may be time to dissolve Sleuths Inc and for everyone to go their separate ways.
But, just as anger threatens to tear them apart, it is hate that will bring them together. Or at least Hate, the original God of the Hunt. Sebastian is invited to participate in Hate’s once-in-a-century decathlon of brawn and brains. Hitting things sounds good to the vampire-wizard detective at the moment and so he enters, taking Tater the groundskeeper with him as Tater, having spurned the affections of the widow Dribblebottom, is keen for a change of scenery.
Dr Goode secretly tags along, partly to keep an eye on Sebastian and partly so he can continue to investigate the Regime Of Witches, Lycanthropes, Idyllists, Nosferata, and Ghouls. The Regime uses the Tournament as a recruiting tool. Head of the Regime Jaikay Ellem is revealed to be behind the threats to Dr Goode but it’s not clear whether she is simply prejudiced against him due to his part-naiad nature or whether she wants him dead for another reason.
Upon starting the contest Sebastian is shocked to see Magnolia in the lineup. She is angry with Sebastian’s attempts to control her use of magic and wants to show him she’s just as capable as he. The two of them go up against each other, and a number of other fantastical beings in ten knockout events, each more bloody than the previous. The Tournament also features two surprise contestants—Lord Bram Polyps, actually Sebastian’s forebear Dracula, and Stonewall, the animated statue imprisoned in Hell who assisted Sebastian in The Cerulean Caduceus. Lord Bram claims to have reformed and even assists Sebastian to make it through a couple of the earlier rounds. Stonewall, meanwhile, earned his way out of Hell and is there trying to win money to start his new life in the world.
Lord Bram’s contrition appears to be genuine, and he even reconciles with his son Nimrod. Nimrod wants to forgive his father for his past misdeeds and there is one thing that will win his trust. He wants Lord Bram to surrender himself to the authorities for the murder of Sebastian’s parents. However, this is where Nimrod learns a long-buried secret. Lord Bram did not kill Sebastian’s parents. He claimed credit for it and he has used their loss to his advantage, but he did not do the deadly deed.
The Tournament of Hate assists Sebastian and Magnolia to resolve their tangled, unrequited romance and Sebastian even comes to admire Magnolia’s control of her powers. But will secrets also tear their reunion apart for not only is Magnolia hiding the physical toll that being the Gem-Herald is having on her, Sebastian has been affected by using magic. When Merlin appeared to Sebastian to help find the Bloodbone Crown, their energies intermingled. During the Tournament Sebastian learns that he received a power boost as a result. Sebastian chooses to keep this from Magnolia, for he also learns the power upgrade has made it difficult for him to control his negative emotions, especially his anger.
All this time, Derek Dippy is trying to leave Za, but to do that he first needs to escape Za’s citizens who have now decided they want their despot leader dead. Derek tries to transport one of his friends to Za but only nets the Derek-simulacrum that Magnolia created . Fake Derek, who the real Mr Dippy quickly dubs “Ferek”, assists him out of Za, but with the angry population hot on their tails.
Derek and Ferek are relieved when representatives from the Regime show up to save them. Too late they learn that the Regime too have an agenda, namely to conquer Za and take its power for their own. In a huge turnaround, Derek and Ferek side with the Za citizens who wanted them dead. But will they die at the hands of the Regime instead? Fortunately, while at the Tournament Dr Goode stumbled across the Regime’s plans for Za and he shows up and helps Derek defeat them.
Meanwhile, in Birmingham, a new love affair blossoms when Stumpy the Dwarf and Mrs Dribblebottom fall for one another. How will Sebastian’s widowed neighbour react when she learns that Stumpy is the host for King Arthur’s parasitic head?
Back in Hate’s realm, Nimrod is heartbroken when he learns that Lord Bram hasn’t really reformed, but was using the Tournament to slowly hypnotise Sebastian. Lord Bram needs Sebastian alive and compliant for it is only with a living Mr Grieve that he can achieve his final goal: creating the Leviathan that he will use to rule the world. It is, in fact, Lord Bram’s emotional manipulation causing Sebastian’s mood swings, not his new powers.
Sebastian defeats Magnolia in battle but, unwittingly, it is Magnolia’s powers that helps him control his new powers and shake off Lord Bram’s machinations. With Magnolia’s help Sebastian reaches the final of the Tournament of Hate. But waiting there is Uncle Bram and their host Hate just decided to change the rules—the final match is a battle to the death.
The series has produced major deaths before, but this time it’s truly significant—a lead character will die and that death will be forever!