Dead in the Water (Daisy Dalrymple #6)1998

Daisy Dalrymple visits relatives with fiancé DCI Alec Fletcher, and covers the 1923 Henley Royal Regatta for an American magazine. But tensions escalate between the Ambrose team coxswain Horace Bott -- shopkeeper's son and scholarship student at Oxford -- and rower Basil DeLancey -- the son of an Earl and all-round bounder -- who keels over and dies mid-race.