The Nine Tailors by Dorothy Sayers

In this novel, when Lord Peter has a car accident in East Anglia, he finds himself conscripted to help ring the bells for the nine-hour-long celebration of the New Year. He fills in ably (is there anything Lord Peter can't do?), and goes on his merry way. He's summoned back around Easter once a strange body is found in a fresh grave. This mystery is full of top-notch detecting (especially figuring out a note encrypted in the tolling of the church bells) and a dash of divine intervention (both in the means of murder and in the way a rather dubious character is brought to justice). There's also a fantastic hiding place for a long-lost emerald necklace.