It chronicles the trials and tribulations of the peoples, set against the backdrop of the aftermath of the General Strike and the Great Depression in the South Wales Valleys.
They include Dan's uncle, John 'Shoni' Lloyd, an ex-First World War soldier and confirmed non-chapel goer, Morgan 'Big Mog' Morgan, an ex-miner, ex-soldier and now a successful bookie and philanthropist, David 'Dai Hippo' Daniels, an ex-miner and firebrand Communist activist, and Guy Sprattling, ('the captain') a badly shell-shocked veteran of the war who works for Big Mog until he is eventually able to face the world again.
He persuades the fiery 'Llew Rhondda', the chapel's choirmaster known as 'God's Songmaster', to revive the tradition of choral performances at Beulah.
On his visit to Evans the Draper, he meets Lucy Meredith and is smitten with her, eventually courting her, whilst carrying on his full-time work at the chapel, giving lectures, producing amateur dramatics and trying to persuade people to come to chapel instead of attending boxing matches and communist rallies.
Shoni, a trained rescue worker, goes down to bring out the trapped miners, with no lives lost, Dan joins an emotional prayer vigil at the pithead.