Blood and the Moon is a poem by Irish poet William Butler Yeats written in 1928 and published in the collection "The Winding Stair" in 1929 before being reprinted in The Winding Stair and Other Poems in 1933.
 Yeats composed the poem in response to the 1927 assassination of Kevin O'Higgins, the Vice-President of the Free State, whom Yeats had known personally.
 The poem contains many themes common in Yeats's poems from the 1920s including the "tower", a reference to "Thoor Ballylee", which had been the title of a collection of works printed the year before "Blood and the Moon" was published, as well as the "gyre" which had been a major focus of his 1920 poem "The Second Coming".
"What Rough Beast" is a phrase taken from the 1919 W. B. Yeats poem "The Second Coming" and has been used as the title for several works of fiction and non-fiction.
"The Second Coming" is a poem written by Irish poet W. B. Yeats in 1919, first printed in "The Dial" in November 1920, and afterwards included in his 1921 collection of verses "Michael Robartes and the Dancer".
 The poem uses Christian imagery regarding the Apocalypse and Second Coming allegorically to describe the atmosphere of post-war Europe.
 The poem is considered a major work of Modernist poetry and has been reprinted in several collections, including "The Norton Anthology of Modern Poetry".
The Widening Gyre is a 1983 novel by Robert B. Parker, featuring his private detective character Spenser.
 The title comes from the first line of W.B. Yeats poem "The Second Coming".
Things Fall Apart is a novel written by Nigerian author Chinua Achebe in 1958.
 The story's main theme concerns pre- and post-colonial life in late nineteenth century Nigeria.
 It is seen as the archetypal modern African novel in English, one of the first to receive global critical acclaim.
 It is a staple book in schools throughout Africa and is widely read and studied in English-speaking countries around the world.
 It was first published in 1958 by William Heinemann Ltd in the UK; in 1962, it was also the first work published in Heinemann's African Writers Series.
 The title of the novel comes from a line in W. B. Yeats' poem "The Second Coming".
Anthony "Tony" J. Jordan is an Irish biographer.
 He is a native of Ballyhaunis, County Mayo.
 He lives at Sandymount village in Dublin.
 Jordan is a graduate of NUI Maynooth, UCD and St. Patrick's College Drumcondra.
 He has been involved in Special Education for many years.
 He specialized in writing 'first' biographies.
 [Major John MacBride, Sean MacBride, Christy Brown, WT Cosgrave, John A. Costello] His early interest centered on the interaction between the figures of Major John MacBride/WB Yeats and Maud Gonne.
 On discovering the MacBride Papers in the National library of Ireland, he has made them available through his books in elucidation on MacBride from the slings and arrows fired by WB Yeats and his admirers.
 [The Yeats/Gonne/MacBride Triangle]
"Slouching Toward Bethlehem" is episode 4 of season 4 in the television show "Angel".
 Its title derives from a line from the W. B. Yeats poem "The Second Coming".
"On being asked for a War Poem" is a poem by William Butler Yeats written on February 6, 1915 in response to a request by Henry James that Yeats compose a political poem about World War I.
 Yeats changed the poem's title from "To a friend who has asked me to sign his manifesto to the neutral nations" to "A Reason for Keeping Silent" before sending it in a letter to James, which Yeats wrote at Coole Park on August 20, 1915.
 The poem was prefaced with a note stating: "It is the only thing I have written of the war or will write, so I hope it may not seem unfitting."
 The poem was first published in Edith Wharton's "The Book of the Homeless" in 1916 as "A Reason for Keeping Silent".
 When it was later reprinted in "The Wild Swans at Coole", the title was changed to "On being asked for a War Poem".
No Longer at Ease is a 1960 novel by Nigerian author Chinua Achebe.
 It is the story of an Igbo man, Obi Okonkwo, who leaves his village for a British education and a job in the Nigerian colonial civil service, but struggles to adapt to a Western lifestyle and ends up taking a bribe.
 The novel is the second work in what is sometimes referred to as the "African trilogy", following "Things Fall Apart" and preceding "Arrow of God". "
Things Fall Apart" concerns the struggle of Obi Okonkwo's grandfather Okonkwo against the changes brought by the English.
Batman: The Widening Gyre is the title of a 6-issue comic book limited series starring Batman, released August 2009 through July 2010.
 The series is written by Kevin Smith and illustrated by Walt Flanagan.
 The title is a reference to the William Butler Yeats poem "The Second Coming".

Question: Which book in the "African Trilogy" takes it's title from the line in WB Yeats poem, "The Second Coming"?
Answer: Things Fall Apart