My Lady Jane! A better title would have been Teens Messing with Henry VIII’s Succession Plans. Lady Jane Grey is a rather tragic figure in English history: ruled England for only 9 days before she was beheaded by her cousin Mary Tudor in the Tower of London. (And then Mary was overthrown by her half-sister Queen Elizabeth.)
The authors decided to give this an alternative history spin, with magic and humor. This is how the succession feud should have gone on. The split between the Roman Catholic Church and Church of England became the split between Eðians (people with shapeshifter abilities) and the non-Eðians.