Broken Country by Clare Leslie Hall

It's 1968 when novelist Gabriel Wolfe comes back into Beth's life. When they were teenagers, Gabriel and Beth were passionately in love. Now, years later, Beth is married to Frank, while divorced Gabriel has moved back to his family's estate, Meadowlands, with his son, Leo. When Frank shoots Leo's dog to protect his lambs, it sets in motion a series of tragedies and secrets for all involved.