Doctor Proctor's Fart Powder is a series of children's novels by Norwegian author Jo Nesbø, illustrated by Mike Lowery. The first novel in the series was Nesbø's first children's book, a contrast from the adult crime novels that he is known for. It was originally published in 2007 in Norway and 2010 worldwide. The series spawned four sequels. The second book in the series, "Bubble in The Bathtub," was published in 2008 in Norway and 2011 worldwide. The third book, "Who Cut The Cheese?" (known as "The End of The World. Maybe." in Norway) was published in 2010 in Norway and 2012 worldwide. The fourth book, "The Magical Fruit" (known as "The Great Gold Robbery" in Norway) was published in 2012 in Norway and 2014 worldwide. The fifth book, "Silent (but Deadly) Night" (known as "Can Doctor Proctor Save Christmas?" in Norway) was published in 2017 in Norway and 2018 worldwide. On October 16, 2018, a box set of the preceding books was released. Source: Wikipedia (en)