MERMAID CHAIR by Sue Monk Kidd

She has a lovely home, a dependable husband and an accomplished and adored teenage daughter. But when shocking news about her mother compels Jessie to visit the island where she grew up, she finds herself drawn to Brother Thomas, a Benedictine monk on the verge of taking his final vows. Amidst the seductive beauty of the South Carolina salt marshes, Jessie is torn between powerful new longings and her enduring marriage.