Just noticed this on Amazon, supposed to be quite a good read from the reviews, and worth a punt as it's free.
Septimus Heap, Book One: Magyk Free with Bonus Material
For a limited time, discover where the Magyk began, for free. This free ebook includes the complete text of Septimus Heap, Book One: Magyk, as well as excerpts of books two through five—plus a sneak peek at Darke, the sixth book in this bestselling series.
Septimus Heap, the seventh son of the seventh son, disappears the night he is born, pronounced dead by the midwife. That same night, the baby's father, Silas Heap, comes across an abandoned child in the snow—a newborn girl with violet eyes. The Heaps take her into their home, name her Jenna, and raise her as their own. But who is this mysterious baby girl, and what really happened to their beloved son Septimus?