Murder at the Polo Club — C.J. Archer

The sport of kings is the backdrop for a game of murder where one player loses more than the match. Can Cleo solve the case, or will the murderer win?
Summer has arrived along with a plethora of social events that keep Cleo and her cousins busy. Between balls, dinners, concerts and picnics, they attend the final match between two proud polo clubs. When the winning team's captain is found murdered in the stables, everyone assumes the opposing team's captain killed him. After all, he was found holding the murder weapon, and everyone knows they hated each other. 
But Cleo isn't convinced. She sets out to prove his innocence alongside Harry Armitage, who was employed to investigate the accused man's family. With their cases overlapping, it makes sense to work together. 
The more they get to know the victim, the more they realize the handsome athlete sported a dark side that few people saw. Those who did had a reason to kill him. Which suspect struck the victim with his own polo mallet? His wife, lover, friends or colleagues? 
Or did the rivalry between two opposing captains spill over to their personal lives, and lead to murder?