After the Great Chicago Fire, people were anxious to know who started it. Clara knows it was not her neighbor Mrs. O'Leary's cow, like the newspaper had reported. Clara will have to become a super sleuth to figure out this mystery! Readers will be captivated by this historical fiction mystery book that features colorful illustrations, short chapter format, and compelling text. Appealing to both reluctant and avid readers, students who enjoy a good "whodunnit" will not be able to put this one down.