Here is some data: Into Battle (novel) FOLLOWED_BY The Violet Keystone; Above the Veil FOLLOWED_BY Into Battle (novel); Above the Veil PRECEDED_BY Aenir; Aenir PRECEDED_BY Castle (novel).

Write a sentence that describes this data
These books were written in the following order - Castle, Aenir, Above the Veil, Into Battle and then The Violet Keystone.