The Unmapped Sea by Maryrose Wood

This is book 5 of the Incorrigible Children of Ashton Place series. A grumpy old doctor recommends that Lady Constance take a sea side vacation at Brighton in the winter to improve her health during her pregnancy.  Lord Ashton invites Penelope and the children to come along, and they accept the invitation with the hope they can make headway on discovering the source of the Ashton Curse by talking to Simon's Uncle Pudge who lives in Brighton.  Once at Brighton the Ashtons meet a Russian family, the Babuskinovs, whose children are even more wild than the Incorrigibles. Much swashbuckling fun and hi-jinx ensue. Soon Miss Lumley has the Babushinov's happily helping in her imaginative escapades, but is she doing her job too well for her own good?  I have really enjoyed all the books of the series, but book 4, I thought, was a little less interesting than the rest, in that it didn't advance the story line very much.  That is not the case with this book.  There are a lot of revelations and plot twists in this installment. Bring on book 6! (404 p)