Crystal Thrasher has written four books about the Robinson family in addition to Julie's Summer. Seely Robinson, Julie's younger sister, is the protagonist in The Dark Didn't Catch Me, Between Dark and Daylight, End of a Dark Road and A Taste of Daylight. These novels are each stand alone stories, but for the full impact of Seely's life and her loyalty to family, the reader needs to start with The Dark Didn 't Catch Me and progress through them to the last one in the series, A Taste of Daylight.

Julie's Summer is independent of the other titles in the series, but a reading of these titles featuring Julie's younger sister, Seely, will help the reader gain a greater insight into Julie's character.