Charlie Mack faces the most difficult case of her career when she goes undercover as a street person a to find a serial killer the police want to ignore.Someone is murdering the homeless in Detroit's Cass Corridor-by immolation. These horrific crimes wouldn't require an investigation by Charlie Mack and her crack team investigators, except one of the burned bodies is her mother's friend. There's a lot wrong with this case: the police won't admit a serial killer is on the loose, drug trafficking intersects with the deaths, and a rogue cop is involved. The timing also couldn't be worse-Charlie and Mandy are finally moving in together. This case becomes the most difficult of Charlie's career when she transforms herself into a street person, and mixes with the corridor's gangs, do-gooders, and the down-and-out to uncover evidence the police can't continue to ignore.