What book comes after 2 Corinthians?

A:2 Corinthians is considered to be one of the genuine epistles of Saint Paul, along with 1 Corinthians, Romans, Galatians, Philemon and probably Philippians and 1 Thessalonians.

2 Corinthians may have originally been three separate letters, fragments of which were later combined into the single epistle we have today.