Given a reference text about No Longer at Ease, tell me the name of the book that precedes it in the trilogy.

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 an education in Britain and then a job in the Nigerian colonial civil service, but is conflicted between his African culture and 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, though Arrow of God chronologically precedes it in the chronology of the trilogy. Things Fall Apart concerns the struggle of Obi Okonkwo's grandfather Okonkwo against the changes brought by the British.

The book that precedes "No Longer at Ease" in the African trilogy is "Things Fall Apart".