Innocent Traitor by Alison Weir

Historical fiction of the life of Lady Jane Grey, also known as the "nine-days queen".  She was queen in between Edward VI and Queen Mary, who ordered Jane's execution.  Jane was the innocent victim of Northumberland, who was trying to grasp power for himself, as well as her scheming parents, who saw advantage for themselves in promoting her accession.  She was 16 when she was executed.

Alison Weir has written over 10 books on this time period, all of them non-fiction: this is her first in the fiction genre.  It's not all that different, I guess, but as she explains, she could take a few more liberties.