When Constable Evan Evans is persuaded to join the local male choir for the upcoming eisteddfod (cultural festival), he doesn't think the addition of his mediocre voice will do them much good. In spite of all the effort that choirmaster Mostyn Phillips puts into the choir, it is not exactly first class. Hope arrives in the form of world-renowned tenor Ifor Llewelyn, come home to Llanfair to rest, on doctor's orders. Llewelyn immediately sets about renewing old friendships, and Mostyn even persuades him to sing with the choir. But Ifor isn't in Llanfair long before the residents decide that his presence is a mixed blessing. Noisy fights between Ifor and his wife, a threatening stranger, and Ifor's warped sense of humor make life in Llanfair increasingly tense.