No Mark Upon Her by Deborah Crombie

Deborah Crombie is a Texan who writes British detective stories.  This latest installment features former partners and newlyweds Duncan Kincaid and Gemma James. A former Olympic caliber rower on the verge of a comeback is found drowned in the Thames. Was it an unfortunate accident or was she murdered? The suspects include her former husband, a shell-shocked Afghanistan war veteran, and a Chief Superintendent with a history of sexually harassing his female staff.  Did I mention that the rower was also a police detective?  563 pages.