"...I hope for many more adventures with ‘Aggie’ and friends!"
Sir Charles Fraith, one time lover of Agatha Raison, is in deep trouble. He has agreed to marry show-jumping mad Mary Brown-Fields, daughter of a millionaire, to solve his financial difficulties in running his country estate. The only problem is, Mary has her own plans for the estate, which were to increase the tenants' rents and turn the estate into some sort of money-making theme park.
Agatha gatecrashes the wedding party, gets into a fight with Mary, and sprays her with mustard and ketchup. Sir Charles, belatedly, and only hours after the ceremony, has seen through Mary and her schemes. Then tragedy strikes. Mary is found in an estate outbuilding, hanging from a wooden beam, obviously dead. Inspector Wilkes appears on the scene, and is convinced that Agatha and Sir Charles were the murderers.
In trying to prove their innocence, Agatha finds herself in Bordeaux, where the smart show-jumping set have congregated, and Agatha starts snooping. Was it snooty show jumper Sheridan Chadwick? Sister and brother Deborah and Jacob Lexington? Or even Claudette, who appears so innocent? And finally, why is Inspector Wilkes so convinced that Agatha and Sir Charles did it, against all the evidence?