Book 7 in the Christie and Agatha's Detective Agency series!The piano is a warning.I’ve taken Miss Margaret. If you want to see her again, Miss Price, pull out of the concert, or else. In Chicago, Christie and Agatha meet composer Florence Price at a small gathering.But any hopes the twins have of hearing Miss Price play are quickly shattered – much like the host Mrs Bond’s wrecked piano!Soon, it’s up to Christie and Agatha to find out who smashed the piano to pieces and where they’ve taken Mrs Bond’s daughter. About the Christie and Agatha's Detective Agency series:It’s not easy growing up in the 1920s.While Christie can usually be found up a tree or trying a spot of amateur engineering, her shy twin Agatha buries her nose in books and dreams of being a writer.The pair couldn’t be more different. But when a scientific discovery goes missing, they find that together they make a winning combination and Christie and Agatha’s Detective Agency is born.Join the twin detectives as they solve thrilling mysteries all over the world!