When a scientist learns that aliens in a parallel world are waging a secret war against the Earth, he disappears into that world and his children set out to find him.

A Dark Traveling 2014, iBooks

ISBN-13: 9781596870024

Trade paperback

Select
A Dark Traveling 2014, iBooks

ISBN-13: 9781596874800

Hardcover

Select
A Dark Traveling 2000, Walker & Company, New York, NY

ISBN-13: 9780802766861

Hardcover

Select
A Dark Traveling 1989, Avon Books

ISBN-13: 9780380705672

Mass-market paperback

Select