The Lost Boys are characters from J. M. Barrie's play "Peter Pan, or The Boy Who Wouldn't Grow Up" and subsequent adaptations and extensions to the story.
 They are boys "who fall out of their prams when the nurse is looking the other way and if they are not claimed in seven days, they are sent far away to the Neverland" where Peter Pan is their captain.
 There are no "lost girls" because, as Peter explains, girls are far too clever to fall out of their prams.
Mass killings occurred under some Communist regimes during the twentieth century.
 Estimates of the death toll vary widely, depending on the methodology used.
 Scholarship focuses on the causes of mass killings in single societies, though some claims of common causes for mass killings have been made.
 Some higher estimates of mass killings include not only mass murders or executions that took place during the elimination of political opponents, civil wars, terror campaigns, and land reforms, but also lives lost due to war, famine, disease, and exhaustion in labor camps.
 There are scholars who believe that government policies and mistakes in management contributed to these calamities, and, based on that conclusion combine all these deaths under the categories "mass killings", democide, politicide, "classicide", or loosely defined genocide.
 According to these scholars, the total death toll of the mass killings defined in this way amounts to many tens of millions; however, the validity of this approach is questioned by other scholars.
 In his summary of the estimates in the Black Book of Communism, Martin Malia suggested a death toll of between 85 and 100 million people.
Lost Girls is a 2012 non-fiction book by the American-Canadian author and journalist Caitlin Rother about the rape and murder of teen-age girls Amber Dubois in 2009 and Chelsea King in 2010 at the hands of John Albert Gardner.
 It was published in July 2012 by Kensington Books.
 It was the author's eighth book.
Albert Gardner (December 31,1930 – November 19, 2010), known as June Gardner or Gentleman June Gardner, was an American jazz and R&B drummer from New Orleans.
Attack on Titan: Lost Girls (進撃の巨人 LOST GIRLS , Shingeki no Kyojin: Lost Girls ) is a Japanese novel written by Hiroshi Seko.
 The book is a spinoff of the manga series "Attack on Titan" by Hajime Isayama.
 A manga adaptation began serialization in August 2015 and ran until May 2016.
 A three-part original anime DVD is set to be released on December 8, 2017, April 9, 2018 and August 9, 2018 with the 24th, 25th and 26th limited edition volumes of the original manga, respectively.
John Albert II, Duke of Mecklenburg[-Güstrow] (5 May 1590 in Waren – 23 April 1636 in Güstrow) was a Duke of Mecklenburg.
 From 1608 to 1611, he was the nominal ruler of Mecklenburg-Schwerin; the actual ruler being the regent, his great-uncle Charles I.
 From 1611 to 1621 John Albert and his brother Adolf Frederick I jointly ruled the whole Duchy of Mecklenburg.
 From 1621, John Albert ruled Mecklenburg-Güstrow alone.
John Albert Gardner III (born April 9, 1979) is an American convicted double murderer and sex offender.
 He confessed to the February 2009 rape and murder of 14-year-old Amber Dubois from Escondido, California, and the February 2010 rape and murder of 17-year-old Chelsea King from Poway, California, after he entered a plea agreement that spared him from the death penalty.
 Additionally, Gardner attempted to rape Candice Moncayo of San Diego County, and had been previously incarcerated for the molestation of a 13-year-old girl.
Paul Albert Gardner AM is the former president of the Melbourne Football Club in the Australian Football League.
 He held that position between 2003 and 2008, when he resigned and was succeeded by Jim Stynes.
Duke John Albert of Mecklenburg (German: "Herzog Johann Albrecht zu Mecklenburg" ; given names "John Albert Ernest Constantine Frederick Henry"; 8 December 1857 – 16 February 1920) was a member of the House of Mecklenburg-Schwerin who served as the regent of two states of the German Empire.
 Firstly from 1897 to 1901 he was regent of Grand Duchy of Mecklenburg-Schwerin for his nephew Frederick Francis IV, Grand Duke of Mecklenburg, and from 1907 to 1913 he was Regent of the Duchy of Brunswick.
John Albert I, Duke of Mecklenburg, in older literature known as "John" or" Johann" (23 December 1525 in Güstrow – 12 February 1576 in Schwerin), was the reigning Duke of Mecklenburg-Güstrow from 1547 to 1556 and of Mecklenburg-Schwerin from 1556 to 1576.
 In 1549 John Albert I saw to it that the parliament of Mecklenburg carried through the Reformation for the entire Duchy.

Question: Who wrote the book Lost Girls, based on killings by John Albert Gardner?
Answer: Caitlin Rother