Jo Beverley's "The Secret Duke" - #10 in the Malloren series

The Secret Duke - Jo Beverley

I enjoyed this one quite a lot, despite all the coincidences and the multiple identities for the main characters. But you have to have read "The Secret Wedding" and maybe one from the Malloren series prior to this one to be able to keep all of the characters in the story straight and to appreciate the plot element of the "cat-rabbits".