A Dangerous Inheritance by Alison Weir, 507 pages

This historical fiction book tells the story of Katherine Grey, sister to Lady Jane Grey, and Kate Plantagenet, daughter to Richard III. Both have relatives who reached for the throne and lost their lives because of it, and have tragic links to the Tower of London even though they're separated by years, their stories have similar links. Alison Weir always does a great job of bringing English history to life in a fascinating story.