Background. Garlic mustard (Alliaria petiolata) is an invasive herb that has spread throughout much of the United States over the past 150 years, becoming one of the worst invaders of forests in the American Northeast and Midwest.ackground. Garlic mustard (Alliaria petiolata) is an invasive herb that has spread throughout much of the United States over the past 150 years, becoming one of the worst invaders of forests in the American Northeast and Midwest.
Mystery fiction. Mystery, 1934 mystery fiction magazine cover. Mystery fiction is a genre of fiction usually involving a mysterious death or a crime to be solved. In a closed circle of suspects, each suspect must have a credible motive and a reasonable opportunity for committing the crime.
Detective fiction is a subgenre of crime fiction and mystery fiction in which an investigator or a detectiveâeither professional or amateurâinvestigates a crime, often murder.