This was an Audible.com selection, The Secret History of the Pink Carnation by Lauren Willing.
If you are a fan of old movies, I am sure you will remember Travor Howard as the Scarlet Pimpernel. You may also have heard of another English fellow, the Purple Gentian. But, have you heard of the Pink Carnation? Me either before this listen; thanks to our heroine, Eloise Kelly! In Eloise's search she comes across letters that tell us "the secret".
The dialog as quick witted as the pace is fast and salted with humor.
Give yourself a giggle and check this one out.