Sweet Murder (Madeline Donovan Mysteries Book 8)

In Madeline's hometown of Chicago on June 1891, life is brimming with new industry. The amateur sleuth has recently arrived home after a trip abroad and brought with her two favorite friends. They plan to enjoy a summer of doing nothing but taking in the sights of the city until the ladies volunteer for a Chicago first. The city has its first ambulance service.
The ladies urge Madeline to attend one of their sessions to meet with someone who claims all manner of mysterious things are happening in the nearby park where the ambulance service frequently stops due to young children's minor injuries while playing. The man wonders if the unwanted activity might be attributed to the Valley Gang.
When the female sleuth agrees to meet with the young man who operates the horse-driven ambulance, a deadly mystery will unfold.