Falling in love with your gorgeous new neighbor isn't a bad thing, but when he turns out to be the bodyguard of a princess from a planet nine billion light-years away, life gets complicated. Seventeen-year-old stargazer Holly Adams never imagined she’d find herself trying to prevent the overthrow of an alien government. When Jai and his sister Amira move into the house down the street, Holly is immediately drawn to them. Jai acts suspicious of her from the start, making Holly more curious about their oddities. When Holly learns they are from a different planet, she does what she can to help protect Amira from Shander, a man who wants to marry her by force in order to take over the kingdom her father rules. Mistaken identity, a botched kidnapping, and a first kiss that bonds Holly and Jai for life are hard enough, but when Shander believes Holly to be the princess, things get even more dangerous.

Amira traveled across the universe to avoid an arranged marriage only to find herself forced into another upon her return hours before her father’s death. As his only heir she should have ruled Rommader uncontested but discovers he's signed an unbreakable marriage contract and finds herself again a bride. While she might be forced to work with Marcus, she refuses to be his wife in any way other than name. As they deal with assassination attempts, visiting dignitaries from other planets leveraging for political gain, and the discovery of unlimited teleportation, her feelings for her husband soften. Marcus proves himself a competent king and kind man, and her admiration for her husband grows stronger, but she refuses to allow herself to fall in love. An unknown foe tries to steal the formula for unlimited travel, giving them the potential power to conquer the universe. Amira and Marcus must work together to stop the thief, but when King Marcus is abducted, Amira may be forced to choose between her husband and her crown.

Holly discovers she can teleport anywhere with only a thought. When Jai is injured, she is forced to take him back to Rommader for neither of them will survive the breaking of their soul bond. Upon arrival, they learn Queen Amira has been kidnapped. On a ship traveling across the universe, Amira is forced to develop a formula for an amulet with unlimited traveling power—or her captors will murder her husband. Unwilling to let her enemies have that much power, Amira must devise a plan to escape while pretending to cooperate, but in order to do so, she realizes she must make an amulet. Can Holly find a way to save her, or will Amira figure out the formula and make it home on her own without being lost in the cold, dark heart of the universe?