Caradoc Evans is perhaps the most controversial writer Wales has ever produced. His first book, My People, met with outrage from the pulpit and the popular press, was banned in Cardiff, but also earned Evans comparison with Zola, Joyce and Lawrence.

In Capel Sion Evans returned to his themes with relish, attacking the Liberal- Nonconformist hierarchy which, he claimed, ground under its heel the peasantry of west Wales. The response was as it had been for his first book, confirmation that an outstanding author was writing at the height of his powers. Capel Sion was originally published in 1916. This edition is edited and introduced by John Harris, the leading authority of Caradoc Evans and tireless researcher into his life and work.