The Daffodil Blonde — Frances Crane

During a stay in Kentucky horse country, a husband-and-wife detective team race to find a killer . . .
 
PI Pat Abbott and his wife, Jean, are vacationing in Kentucky horse country and visiting Pat's old friend Rob Murray, who lives there with his sister and daughter. But when Rob's trainer is found dead, Pat is willing to bet it's murder despite the local doctor's verdict of suicide. The quest to find the truth will involve a fainting blonde at the Abbotts' hotel and some of the more colorful citizens of Lexington in this suspenseful Golden Age classic featuring “one of the more interesting married teams of detectives” (Thrilling Detective).
 
Praise for the Pat and Jean Abbott Mysteries
“Lively and exciting.” -- The New York Times

“[A] well-plotted and mystifying case.” -- Saturday Review
 
“Nasty characters and clues pointing off in all directions -- quite good.” -- The Miami News