Forty-one years ago the renowned physicist Chris Robin vanished. Before his disappearance, his fringe science theories about the existence of endless alternate universes had earned him both admirers and enemies.

Alex Benedict and Chase Kolpath discover that Robin had several interstellar yachts flown far outside the planetary system where they too vanished. And following Robin's trail into the unknown puts Benedict and Kolpath in danger...

A new novel of the fantastic unknown by the national bestselling author of Time Travelers Never Die.

Eccentric Sunset Tuttle spent his life searching in vain for forms of alien life. Thirty years after his death, a stone tablet inscribed with cryptic, indecipherable symbols is found in the possession of Tuttle's onetime lover, and antiquities dealer Alex Benedict is anxious to discover what secret the tablet holds. It could be proof that Tuttle had found what he was looking for. To find out, Benedict and his assistant embark on their own voyage of discovery-one that will lead them directly into the path of a very determined assassin who doesn't want those secrets revealed.

"The logical heir to Isaac Asimov and Arthur C. Clarke" (Stephen King) takes readers on a science fiction adventure tour through time.

When physicist Michael Shelborne mysteriously vanishes, his son Shel discovers that he had constructed a time travel device. Fearing his father may be stranded in time-or worse-Shel enlists the aid of Dave MacElroy, a linguist, to accompany him on the rescue mission.

Their journey through history takes them from the enlightenment of Renaissance Italy through the American Wild West to the civil-rights upheavals of the 20th century. Along the way, they encounter a diverse cast of historical greats, sometimes in unexpected situations. Yet the elder Shelborne remains elusive.

And then Shel violates his agreement with Dave not to visit the future. There he makes a devastating discovery that sends him fleeing back through the ages, and changes his life forever.