Arundel Granville and the Malcontent Toad

When trying to break Barty Crouch out of Azkaban, Arundel unwittingly releases a plague on the Magical Community and her sister, along with many others has turned into a toad. With the help of Severus Snape and the Malfoys can Arundel fix her mistake. Book 2 in the Arundel Granvill series but works as a stand alone story. Readers may want to first read the Grants Artifacts.