It is one of the simplest services the church has. There is no sermon. A series of short readings from the Bible, called lessons, is read aloud by different voices from the congregation. Between the readings, the choir sings and all of us sing carols and hymns together.

Read in order, the lessons tell one long story: a world that has lost its way, prophets who promise that God has not forgotten it, and a young woman who says yes. The music answers each reading as it goes.

The form began in Truro, England, in 1880 and became famous through King's College, Cambridge, which has broadcast its service every Christmas Eve for nearly a century. Saint Dunstan's has kept its own version for 56 years by including a variety of musical styles.

If you have never been

• Come as you are. Plenty of people at this service are visiting, curious, or have not been to church in years.

• Everything is printed for you. The order of service has every reading and every word to every carol. You will not need to know when to stand or sit; just follow the people around you.

• Sing or listen. Either is a full way to take part. Some carols are for the choir alone.

• Stay afterward. A reception follows in the parish hall. It is a good chance to meet people, and there will be food.