The carousel - Rosamunde Pilcher

The Carousel
Prue is intelligent, artistic, independent - and bored. Pressurized by her mother to make a conventional and dull marriage, she is delighted to escape London and seek retreat with her eccentric and bohemian aunt in Cornwall.
A chance encounter with an attractive young artist on the sea shore leads to day after idyllic summer's day of exploring the Cornish countryside and coast. But there is something troubling Daniel and Prue, now deeply entangled, feels compelled to discover what it is.
Voices in Summer
Laura, newly married and ever conscious of the shadow of her husband Alec's first wife, takes a holiday with his family in Cornwall. Through the long, hot summer days she is charmed by the beautiful old house and the people she learns to know and love. The sight of the sparkling, brilliant sea quiets for a while her uneasy spirit. Only an anonymous letter, accusing her of having an affair, can threaten her new-found tranquillity.