The Grave Tattoo by Val McDermid

A rainy summer has brought a body to light in one of the district's bogs. At first glance, numerous characteristics, including the presence of black tattoos considered native to the 18th century South Seas area, suggest it might be Fletcher Christian. Jane Gresham, born-in-the-Lake District Wordsworth scholar, has long thought local gossip about the poet and the poem might be true, so the finding of this body causes her to go home to research the possibilities.

I liked the excerpts from Fletcher Christian's story at the beginning of each chapter.
Multiple, but related plots converge from multiple points of view and the conclusion is tidy.