In this spellbinding finale to an epic series, Septimus Heap must decide once and for all where his heart lies – with Magyk or with Alchemie and Physik. When, at last, Marcia agrees to allow the recently re-instated Castle Alchemist, Marcellus Pye, to open the Great Chamber of Alchemie and Physik, she fears she is unleashing more than she understands. But Marcia must learn to trust Marcellus, and together they must rid the Castle of the evil Two-Faced Ring. Caught between the two, will Septimus be able to bring both sides together? “Praise for Septimus Heap: Warm, funny and humane, Sage takes care with the destiny of even her smallest characters, and is a real discovery” – The Times “Sage navigates her complex setting with suspenseful and well-structured plotlines . . . These books open an array of dazzling worlds. It's worth hopping aboard this bus, and I'm eagerly waiting at the stop” – The Times “Wonderfully imaginative . . . Children of all ages will relish this” – Waterstones Guide to Kids' Books “An immensely powerful and imaginative adventure, full of surprises, with good and bad magic and it moves at a rattling pace . . . You will not want to leave this imaginary world”