What are a few themes from Stephen King's "Desperation"?

Desperation is about a lowly populated mining town in Nevada, where a group of people are stopped while traveling along a main road nearby seemingly by a policeman. They are taken group by group to the town of Desperation and imprisoned in the jailhouse. The novel also talks about their escape from imprisonment, to hiding unsuccessfully in the town then to taking on the Evil that has been uncovered down the recently re-opened mine. The overall theme of Stephen King's novel "Desperation" is the fight of Good against Evil.