Lisa longed for a sister. She knew that if she had a sister they would never fight. Lisa was nine years old and she wouldn't care if her sister were only two or even sixteen. When her parents brought her on summer vacation to their new cottage by the sea, she had a strange feeling of excitement. Maybe she would meet someone special while at the cottage, maybe another only child, and they could be like sisters all summer long.

When Lisa meets her new seashore neighbours, her summer of adventure is only beginning.