It is the summer of 1669 and England is in dire straits. The treasury's coffers are bare and tensions with the powerful Dutch Republic are boiling over. And now, an investigator sent by the King to look into corruption at the Royal Navy has been brutally murdered. Loathe to leave the pleasures of London, Samuel Pepys is sent dragging his feet to Portsmouth to find the truth about what happened. Aided by his faithful assistant, Will Hewer, he soon exposes the killer. But has he got the right man? The truth may be much more sinister. And if the real plot isn't uncovered in time, England could be thrown into a war that would have devastating consequences...