Like the other books in the series, it includes links and passwords to online videos which form an essential part of the plot.

Ghost in the Machine picks up where Skeleton Creek left off, with Ryan and Sarah trapped in the Dredge.

This includes, spying on Ryan's dad, and encounters with Old Joe Bush, the horrifying ghost of the Dredge.

In the end, Ryan and Sarah discover that the Dredge is filled with millions of dollars worth of gold and that Henry is really insane and has been disguising himself as Old Joe Bush.

Booklist's Courtney Jones noted that, "In the first book, readers could get by without seeing the supplemental videos on Sarah's Web site, but in this go-round, the story suffers without them".