Question: Sergei Rachmaninoff's "Prelude in C-sharp minor" which played a prominent part in the detective novel "Overture to Death" was a single part of how many pieces to the ternary prelude he composed titled "Morceaux de fantaisie"?
Context: The prelude and fugue in C-sharp minor, BWV 849, is a pair of keyboard compositions by Johann Sebastian Bach.  It is the fourth prelude and fugue in the first book of "The Well-Tempered Clavier", a series of 48 preludes and fugues by the composer. Overture to Death is a detective novel by Ngaio Marsh; it is the eighth novel to feature Roderick Alleyn, and was first published in 1939.  The plot concerns a murder during a village theatrical performance; Sergei Rachmaninoff's "Prelude in C-sharp minor" plays a prominent part in the story.  So does a "Venetian Suite" by Ethelbert Nevin.  The murder weapon is a pistol hidden in a piano. Suite No. 1 (or "Fantaisie-Tableaux" for two pianos), Op. 5, is a composition for two pianos by Sergei Rachmaninoff.  Composed in the summer of 1893 at the Lysikofs estate in Lebeden, Kharkov, this suite was initially titled "Fantaisie (Tableaux)" since Rachmaninoff intended it, as he explained in a letter to his cousin Sofia Satin, to consist "of a series of musical pictures."  While François-Rene Tranchefort asserts that the music illustrates four extracts of poems (written by Mikhail Lermontov, Lord Byron, Fyodor Tyutchev and Aleksey Khomyakov), Rachmaninoff biographer Max Harrison counters that while the poems "convey something of the emotional tone of the music," the music itself is not programmatic. Morceaux de salon (French for "Salon Pieces"; Russian: Салонные Пьесы , "Salonnyye Pyesy"), Op.  10, is a set of solo piano pieces composed by Russian composer Sergei Rachmaninoff in 1894. The Prelude in E-Flat Minor, Op. 23 No. 9 is a 1903 composition by Sergei Rachmaninoff.  It is part of Rachmaninoff's Ten Preludes, Op. 23, and is arguably the most difficult of the set. The compositions of Sergei Rachmaninoff (1873–1943) cover a variety of musical forms and genres.  Born in Russia, he studied at the Moscow Conservatory with Nikolai Zverev and Anton Arensky, and while there, composed some of his most famous works, including the first piano concerto (Op. 1) and the Prelude in C-sharp minor (Op. 3, No. 2).  Although spread over three different opuses, he did go on to complete an important set of 24 preludes in all the major and minor keys.  His Symphony No. 1 (Op. 13) was one of his first compositions as a "Free Artist" after graduation, and subsequently his first critical failure.  The derision he received sent him into depression.  After being sent through autosuggestive therapy, he composed his second piano concerto (Op. 18), which is still part of the major orchestra repertoire today.  In 1909, he made his first tour of the United States, and composed Piano Concerto No. 3 (Op. 30), notable for its difficult cadenza.  After this, due to migration from Russia in 1917 and his busy concert career, his output as a composer decreased, and during this period, he completed only six compositions.  His last work, "Symphonic Dances" (Op. 45), was completed in 1940. Morceaux de fantaisie (French for "Fantasy Pieces"; Russian: Пьесы Фантазии , "Pyesy Fantazii"), Op.  3, is a set of five piano solo pieces composed by Sergei Rachmaninoff in 1892.  The title reflects the pieces' imagery rather than their musical form, as none are actual fantasies.  The set was dedicated to Anton Arensky, his harmony teacher at the Conservatory. The Prelude in F-sharp minor, Op. 23, No. 1 is a composition by Sergei Rachmaninoff completed and premiered in 1903.  It is one of ten preludes composed by Rachmaninoff in 1901 and 1903. The Prelude in C minor, Op. 23, No. 7 is a 1903 composition by Sergei Rachmaninoff.  It is part of Rachmaninoff's Ten Preludes, Op. 23. Prelude in C-sharp minor (Russian: Прелюдия ), Op.  3, No. 2, is one of Sergei Rachmaninoff's most famous compositions.  It is a ternary (ABA) prelude for piano in C-sharp minor, 62 bars long, and part of a set of five pieces entitled "Morceaux de fantaisie"; and also known as "The Bells of Moscow" since the introduction seems to reproduce the Kremlin's most solemn carillon chimes.
Answer: five pieces