Following the further adventures of Danielle, Talia, and Snow (respectively Cinderella, Sleeping Beauty, and Snow White), the story picks up as Danielle sails with her mother-in-law on a diplomatic mission to the mermaids--which goes terribly wrong, terribly quickly. The three princesses must race to save their Queen and Kingdom in this fast-paced, exciting sequel to The Stepsister Scheme.
The series is one of the best I've seen at genuinely updating the sensibilities of the characters, making them three-dimensional and feminist, while retaining the fun and whimsy--as well as the darker sides--of the fairy tales they draw from.
I am mentioning this book in its own entry because, well, it's awesome in its own right. I suggest reading the books in order, as there is a lot of character and plot development that's consistent through the series. Hines follows this one up with Red Hood's Revenge, and I am looking forward to the fourth installment, The Snow Queen's Shadow, which should be released next July.
Also be sure to check out Hines's blog for more information on upcoming books and a number of other cool topics.