Hardback book in dustwrapper "Blue at the Mizzen" by Patrick O'Brian, published by HarperCollins in 1999.  Minor creasing to edges of unclipped dustwrapper, sticker on front panel ("The New Aubrey/Maturin Adventure"), some yellowing to the pages, otherwise a good clean tight copy of this hard-cover book, the twentieth in the author's Aubrey/Maturin series of novels.  This one, the last to be published in the author's lifetime, is set just after the end of the Napoleonic Wars, and involves the Chilean War of Independence.  First UK edition, with the number line starting with a 1.  262pp.