Estranged for years from her father and four brothers after her mother's death, Carson Cartwright is surprised when she gets a phone call from her twin brother, urging a reconciliation before their father succumbs to his final illness. Though she has spent more than a decade trying to forget her family existed, she is suddenly pulled back to the Montana ranch where she grew up. Carson discovers her brothers divided over plans to change their working ranch into a guest ranch, and their consultant, Kerry Elder, doesn't seem above using her wiles to get her way. Kerry finds that while she may have her clients right where she wants them, it's the wayward sister that may be awakening something she has long denied. The big Montana sky crackles with thunder and lightning as emotions twist in unbidden directions. Neither Carson nor Kerry is prepared for the wild storms of summer.