It is about how Nancy Drew and her friends Bess and George visit Nancy's friend Colleen Healey. Colleen owns a very spactacular horse named Nightingale.
A mystery soon appears when Nightingale gets sick from something that was put into her food. Then many other bad things start to happen. Nancy thinks that someone is trying to get Nightingale from doing this horse competition that could get Colleen a lot of money because Nightingale is a very talented horse. - Ruby
