<P> The antagonist of the third book, Physik (published in March 2007), is the 500 - year - old spirit of Queen Etheldredda, who is accidentally released by Silas Heap . She sends Septimus to her immortal son Marcellus Pye . He is transported back in time to become the apprentice of the young Marcellus Pye, an alchemist who teaches him about "Physik". In the present timeline of the novel, the Castle is infected by a deadly plague and Queen Etheldredda has the plan to acquire eternal life . Jenna and Nicko meet a young trader Snorri Snorrelssen with whom they travel in time to bring Septimus back though Nicko and Snorri couldn't escape . There, Jenna is taken to the living Queen Etheldredda, but she escapes with Septimus and they return to the present Castle . Marcia then destroys the substantial spirit of Etheldredda and Septimus brews an antidote to the plague using his knowledge of Physik . </P> <P> The quest of the fourth book, Queste (published in April 2008), is a journey in time to the House of Foryx, in which "all times meet", to bring back Nicko and Snorri, who were trapped there after the events of the third book . Septimus is sent on this mission for nefarious reasons by a ghost called Tertius Fume . Assisted by Jenna and his friend Beetle, among others, he pieces together a map to the House of Foryx . When they reach the house, Septimus meets Hotep - Ra, the first ExtraOrdinary Wizard, while Jenna and Beetle find Nicko and Snorri . Marcia and Sarah Heap arrive outside the house on Spit Fyre, and they return together to their own time . </P> <P> The fifth book, Syren (published in September 2009), continues from where Queste ended . Septimus decides to bring back his friends from the House of Foryx country and he, Jenna and Beetle get trapped in a mysterious island . There he meets a mysterious girl called Syrah Syara who tells him about a dangerous plot by Tertius Fume to destroy The Castle . Together with the help of the others and a safe - charm jinnee sent to him by Aunt Zelda, Septimus stops the invasion of The Castle by Fume and his jinnee warriors and saves Syrah from a terrible enchantment of a malice ghost called the Syren . </P> <P> The sixth book, Darke (published in America in June 2011 and England in October 2011), sees Septimus and his friends battling the Darke which has engulfed the Castle and everything and everyone in it . The only thing that is standing in between is Merrin Meredith and his gang of Things and his Darke Dragon . Alther Mella has been Banished (together with Tertius Fume) and Septimus wants to release him from the Darke Halls thinking he could help in undoing the Darke . When Marcia Overstrand, the ExtraOrdinary Wizard undoes the Darke spell with the help of the Paired Codes, all is well . Beetle becomes Chief Hermetic Scribe; Simon is reunited with his family after leaving his past behind and Princess Jenna is happy that the Palace and Castle are back to normal . </P>

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