is everybody?" Nobel Prize-winning physicist Enrico Fermi once asked after a discussion about the possibility of intelligent life elsewhere in the universe. To sum up the Fermi Paradox, if the billions of stars in our galaxy have planets with intelligent life on them, why hasn't anyone visited us?

But maybe they have, and we just haven't noticed--and that's the way they want it. And if they are here in secret, why are they here? Are they tourists? Anthropologists, perhaps? Or journalists sending stories back about the quaint habits of the primitives? Or maybe the extraterrestrial equivalent of hunters or fishermen? (Any odd disappearances in your neighborhood lately?) An enemy already within the gates? Or a refugee seeking sanctuary? Gourmets looking for exotic foreign food? Alien criminals hiding out? Alien cops looking for those alien criminals? No missionaries--at least not yet--and there doesn't seem to be a Galactic Peace Corps. They might happen to look close enough to human to pass, or they might be masters of disguise. Or they might be so incomprehensibly different that we don't even notice that they're here.

The secret visitors are revealed by such luminaries as Larry Niven, Poul Anderson, Spider Robinson, Neil Gaiman, and more. And if any alien visitors want to check out the local natives' speculations herein, feel free. Please pay with local currency, of course.

Praise for previous anthologies edited by Hank Davis:

About Time Troopers:

"The editors' mastery of the military SF and time travel subgenres is evident in their thoughtful selections. Fans of literate speculative fiction will hope for more from these experts."--Publishers Weekly

Cosmic Corsairs:
"Who doesn't like space pirates? (Well, their victims I guess, but that's beside the point.) . . . Hank Davis has a fine sense for choosing a wide mix of stories, and this book is no exception. No story is like another, yet they manage to form a whole greater than the parts. From sapient ships to piratical sibling rivalry, pirate detectives to ingenious captives seeking freedom, from alien biology to orbital mechanics, the stories share some of the same elements--pragmatic thinking, moral complexity, loyalty, and betrayal. Definitely a fun one."--Analog

In Space No One Can Hear You Scream:
"[T]he 13 tales in this collection blend sf with horror to demonstrate the resiliency of both genres . . . offers strong tales by the genre's best storytellers." --Library Journal

"[F]irst-rate science fiction, demonstrating how short stories can still entertain." --The Galveston County Daily News

A Cosmic Christmas 2 You:

"This creative and sprightly Christmas science fiction anthology spins in some surprising directions. . . . A satisfying read for cold winter evenings . . . a great stocking stuffer for SF fans." --Publishers Weekly

As Time Goes By:

"As Time Goes By . . . does an excellent job of exploring not only romance through time travel--relationships enabled or imperiled by voyaging through time--but the intrinsic romance of time travel itself. . . . The range of styles and approaches is as wide as the authors' sensibilities and periods might suggest . . . full of entertaining and poignant stories . . . " --Alvaro Zinos-Amaro, IntergalacticMedicineShow.com

Praise for previous anthologies edited by Sean CW Korsgaard:

About Worlds Long Lost:

"Editors Christopher Ruocchio and Sean CW Korsgaard have given fans of this venerable genre something special... Worlds Long Lost definitely has something for everyone who loves a touch of the crawling chaos." --The Wall Street Journal

"Ruocchio (the Sun Eater series) and Korsgaard bring together 14 mind-bending and often disturbing tales of ancient extraterrestrial civilizations throughout the universe...Full of creepy flights of imagination and thought-provoking science, this will be a hit with fans of first contact sci-fi."--Publisher's Weekly

"Ruocchio and Korsgaard have shown themselves to have the taste and the discernment of master vintners, going through the grapevine of the science fiction genre to find the sweetest berries. Worlds Long Lost is no mere vinegar, but the finest vintage you can find today. If science fiction were wine, this anthology sparkles, both like champagne, and like the stars in the heavens." --Warped Factor

"Readers are treated to tales of wonder and horror of ancient alien civilizations, from mischievous youngsters to curses of long-lost gods... For readers looking to escape to another galaxy, prepare to be rocketed to Worlds Long Lost." --Portland Book Review

"Fourteen new stories involving the discovery of ancient alien artifacts, on Earth or elsewhere in the universe, appear in this anthology. The pieces range from intellectual puzzles to tales of adventure, with a fair amount of horror thrown into the mix." --Tangent Online

"Worlds Long Lost delivers on its promise to take you out of this world." --Upstream Reviews