Part 1 - S1.E1

Louis Trevelyan marries the young Emily Rowley and are quite happy until Colonel Osborne arrives and starts to tempt Emily away from her husband.Emily continues to meet Osborne, refusing to make any promises to her husband that would imply a stain on her character. Neither side will back down and a gulf begins to grow between them, punctuated by increasingly bitter rows and failed attempts at reconciliation.