Question: What novel is a sequel to crime book featuring Theodore Roosevelt and J. P. Morgan investigating the death of a 13-year old boy?
Context: The Lake Bodom murders took place in Finland in 1960 on the shores of a lake by the city of Espoo.  Two 15 year old girls and an 18 year old boy were stabbed and battered to death during the early hours.  The victims had been sharing their tent with an 18 year boy, who was found in the morning at the scene, apparently unconscious.  He had a jaw fracture and knife wounds, but made a full recovery.  Nils Wilhelm Gustafsson said he could not remember what had happened.  Despite bloodstained shoe-prints at and leading away from the scene of the crime matching the soles of Gustafsson's footwear (found hundreds of meters away) he was seemingly not considered a prime person of interest for the original investigation. The Angel of Darkness is a 1997 crime novel by Caleb Carr that was published by Random House (ISBN  ) and is a sequel to "The Alienist" (1994), and is the second book in the Kreizler series. The Roosevelts: An Intimate History is a 2014 American documentary film directed and produced by Ken Burns.  It covers the lives and times of the Roosevelt family, including Theodore Roosevelt, a Republican and the 26th President of the United States; Franklin D. Roosevelt, a Democrat and the 32nd President of the United States, a cousin of Theodore; and Eleanor Roosevelt, the longest-serving First Lady of the United States, a niece of Theodore who had wed Franklin.  As a result of the influence of Theodore and Franklin as Presidents, as well as Eleanor as First Lady, a modern democratic state of equal opportunity was begun in the United States.  The documentary film begins with the birth of Theodore in 1858 and ends with the death of Eleanor in 1962. The Alienist is a crime novel by Caleb Carr first published in 1994 and is the first book in the Kreizler series.  It takes place in New York City in 1896, and includes appearances by many famous figures of New York society in that era, including Theodore Roosevelt and J. P. Morgan.  The sequel to the novel is "The Angel of Darkness".  The story follows Roosevelt, then New York City police commissioner, and Dr. Laszlo Kreizler, as their investigative team attempts to solve gruesome murders through new methods including fingerprinting and psychology.  The first murder victim investigated is a 13-year-old immigrant who has had his eyes removed, his genitals removed and stuffed in his mouth, and other injuries.  The investigators deal with various interest groups that wish to maintain the status quo regarding the poor immigrant population in New York City. Roosevelt in Africa is a film by Cherry Kearton, released in 1910.  It is a documentary featuring Theodore Roosevelt in Africa.  It is shot in silent black and white. The Imperial Cruise is a non-fiction book authored by James Bradley.  In the book Bradley examines American policy in the Pacific during the presidency of Theodore Roosevelt, and a surrounding a secret diplomatic/Congressional mission to Asia conceived by Roosevelt which would affect United States involvement in Asia.  The material also covers a wide array of other cultural factors that loosely relate to this, the largest diplomatic delegation ever sent to Asia in U.S. history.  The book asserts that Roosevelt's diplomatic mistakes constituted the original encouragement for the Japanese imperialism that ultimately backfired on the United States and led to the war in the Pacific, and acted as a catalyst in the fomentation of many subsequent events in Asia, including the Chinese Communist Revolution, the Korean War, and even the current state of U.S.-Asia affairs today in the 21st century.  Some historians, specialists and reviewers have pointed out Bradley's methods and faulty analysis to his new claims.  Yet, the evidence presented by the author in the form of Roosevelt's personal letters, pictures and hard data are beyond reproach for historical fans of Theodore Roosevelt. George Walbridge Perkins I (January 31, 1862 – June 18, 1920) was an American politician and businessman.  He was a leader of the Progressive Movement, especially the Theodore Roosevelt's Progressive party of 1912.  Starting as an office boy he became a leading executive in insurance, steel and banking, always on the alert for new and better ways to do business.  He was a top aide to financier J. P. Morgan, and handled complex issues involving U.S. Steel, International Harvester, and other large corporations and insurance companies.  He was vice-president of New York Life Insurance Company and a partner in J.P. Morgan & Co. He served as president of the Palisades Interstate Park Commission from its creation in 1900 until his death in 1920. The Rise of Theodore Roosevelt (1979) is a biography of United States President Theodore Roosevelt by Edmund Morris and published by Coward, McCann & Geoghegan when the author was forty years old.  It is the first in a trilogy continued more than twenty and thirty years later by "Theodore Rex" (2001) and "Colonel Roosevelt" (2010).  It won the 1980 Pulitzer Prize for Biography or Autobiography and the 1980 National Book Award in Biography. USS "Theodore Roosevelt" (SSBN-600), a "George Washington"-class submarine , was the second ship of the United States Navy to be named for President Theodore Roosevelt (1858–1919).  Initially unnamed and assigned hull classification symbol SSGN-600 as a guided missile submarine, her keel was laid down on 20 May 1958 by the Mare Island Naval Shipyard using components initially assembled for the "Skipjack"-class submarine nuclear attack submarine  .  She was named "Theodore Roosevelt" and redesignated fleet ballistic missile submarine SSBN-600 on 6 November 1958, launched on 3 October 1959 sponsored by Mrs. Alice Roosevelt Longworth (1884–1980), daughter of the ship's namesake, and commissioned on 13 February 1961 with Commander William E. Sims commanding the Blue Crew and Commander Oliver H. Perry, Jr. commanding the Gold Crew. The Theodore Roosevelt Monument Assemblage is a collection of 24 stones and plaque located in the Theodore Roosevelt Memorial Park in Oyster Bay, New York.  The stones and other objects are meant to each represent a "chapter" and together form a "book" telling the story of Theodore Roosevelt, 26th President of the United States.
Answer: The Angel of Darkness