High Quality Content by WIKIPEDIA articles! Physik is the third book in the Septimus Heap series written by Angie Sage. It is the sequel to Flyte. The novel was released on March 28, 2007. The sequel of Physik is Queste. The cover of this book is based on the in-story book: I, Marcellus with a vial of the Eternal life formula on top of it.