This tense story follows Captain Butterfly, Marjorie Butera, a 19-year veteran of the force. Assigned to the Internal Affairs Division, charged with finding proof of the corruption in the force, Butera's investigation focuses on vicious Inspector Ronald Janesky. But Janesky—in line for promotion to commissioner, with a record based on illegal arrests and torturing prisoners—is apparently untouchable. Captain Butera's fellow (male) officers fear Janesky and despise the Butterfly as a female snitch. Only her lover, journalist Charles Rose, supports her decision to expose the crooked cop.