High Quality Content by WIKIPEDIA articles! Jenna Heap is a leading character in the Septimus Heap book series by Angie Sage. She is the adoptive sister to Septimus and the adoptive daughter of Silas Heap and Sarah Heap. Jenna has many friends in the book, yet also a lot of enemies. Although she acknowledges they are not her real family Jenna loves her adoptive family very much - this includes her 7 brothers, her Grandpa Benji, her Mum and Dad and her Aunt Zelda.