Books in the Star Mappers series

Her best friend has gone nuts-as in totally outer limits. Mel knows Nora has packed her bags along with all that crazy and run off to join a cult. A cult that believes that humankind must move on into the 4th dimension or perish. And even though Nora betrayed her, Mel knows she must find her and help bring her home before her closest friend ends up dead. But Mel unexpectedly finds herself drifting between the shadows of her fears and what really is…and the reality of what's happening on Earth is far worse than she could have imagined.