A cozy mystery with witches, talking cats and magic Brimstone - a town where supernatural beings live - and where crime is on the increase. Just like her gran, Cassia Winter is a witch. The Winter witches are responsible for investigating crimes in Brimstone. The only problem is, Cassia doesn't know she's a witch yet. When Gran tells Cassia about her true nature, Cassia dismisses it as nonsense. But a terrible incident causes Cassia to change her mind. With her cat, Stanley, at her side, Cassia enters Brimstone and is soon investigating the murder of a werewolf.