Shelby Marano is the youngest of three sisters and was always Daddy's baby girl-until her father was murdered when she was only eight years old. Ever since, she's been running from anyone or anything that could truly hurt her. Instead, she seeks calculated thrills that leave her exhilarated, but when she's caught outside during a summer storm, she quickly realizes not all adventures are within her control.

Tyler Burgess struggles with the responsibility of caring for a mother suffering from Alzheimer's disease. Forced to take a leave of absence from work and put his life on hold, his only reprieve is the volunteer work he does at the local museum. When a soaking-wet Shelby barges in, he offers her both refuge from the rain and a safe place to land. She's the breath of fresh air he didn't know he needed.

Tyler proves to be much more than just a nerd in a history museum, but what she finds out about him is a dealbreaker for her. As family health issues and an unknown stalker threaten Shelby's perfect little world, she learns a hard lesson: no one can hide from the dangers of life. Can Shelby let her sisters, Tyler, and even more importantly, God, show her in one Sweet Summer that love is worth taking the risk?