When former foster kid Adrianna sets out to enjoy the last summer with her adopted sisters before the oldest leaves for college, the last thing she expects is to find the man who knew their parents. Nor did they expect to learn their parents were part-alien from a system of planets known as the Diamond Realms, nor that each has the power to communicate with and control the natural elements. Danger looms from an alien threat that seeks to abuse their power, so the trio and two other girls with similar pasts join with their parent's people to escape across the galaxy to their parents' home planet Almnerixi. While her friends grapple with the responsibility of appearing as the mystical and beneficent Protectors to the people of the Diamond Realms, Adrianna struggles to balance her concept of family and herself with the feeling that she is falling further down the path of the prophesized Destroyer of magic and unity in the Realms.