Justine and Perry, 19-year-old twins, are on an epic trip from Australia to the Pacific Northwest. It has been a year since their father died from cancer, and Perry, who has high-functioning autism, is about to move into an assisted-living community. Justine has her own agenda; she plans for them to connect with the mother who abandoned the family when the twins were small. The twins narrate the story in alternating first-person voices, which work in delicate counterpoint to each other. Perry wants to move to the community to set Justine free, while Justine grapples with guilt and responsibility, as well as some truths about her family revealed in the journal her father left for her to read. Perry's portrayal is a convincing depiction of what the world might look and sound like to a person with autism. Justine is pragmatic and responsible, but she is also capable of humor and whimsy. Groth's positive, if heart-wrenching, story about love and learning when to let go will appeal to fans of character-driven novels.