The library has twelve Plaidy books, but most of them don't have blurbs, so I can't tell much about them.

Have you read any of these? Are there any you'd consider a good starting point?

The Reluctant Queen
The Murder in the Tower
The Princess of Celle
Queen of This Realm
The Wandering Prince
Epitaph for Three Women
Madame Serpent
The Vow on the Heron
The Queen's Husband
Mary, Queen of France
The Queen's Secret
Victoria Victorious