The first thing to note is that Jack Jewers is a friend of mine, whom I adore, which may color my reading a bit. But the second thing to note is that this book is just plain fun. The premise is, as the title suggests, that Samuel Pepys kept one further diary beyond those we know of, and that this one involves a complex investigation involving embezzlement, murder, and international intrigue. The writing is delightful, and the book was a perfect bit of holiday fun.