On a cold spring night in 1952, a huge meteorite fell to earth and obliterated much of the East Coast of the US, including Washington, DC. The ensuing climate cataclysm will soon render the Earth inhospitable for humanity, as the last such meteorite did for the dinosaurs. This looming threat calls for a radically accelerated effort to colonize space and requires a much-larger share of humanity to take part in the process. Elma York’s drive to become the first lady astronaut is so strong that even the most dearly held conventions of society may not stand a chance against her.

Mary Robinette Kowal continues the grand sweep of alternate history begun in The Calculating Stars. The Fated Sky looks forward to 1961, when mankind is well established on the moon and looking forward to its next step: journeying to, and eventually colonizing, Mars. Of course the noted Lady Astronaut Elma York would like to go, but there’s a lot riding on whoever the International Aerospace Coalition decides to send on this historic - but potentially very dangerous - mission. Could Elma really leave behind her husband and the chance to start a family to spend several years traveling to Mars? 

This book is a stimulating and entirely plausible insight into how Hitler and his generals might have defeated the Allies, and a convincing sideways look at the Third Reich's bid at world domination in World War II. What would have happened if, for example, the Germans captured the whole of the BEF at Dunkirk? Or if the RAF had been defeated in the Battle of Britain?

A military unit is thrust back into Paleolithic times with only their guns and portable hardware. Ten soldiers on convoy in Afghanistan suddenly find themselves lost in time. Somehow they arrived in Earth's Paleolithic Asia. With no idea how they arrived or how to get back, the shock of the event is severe. They discover groups of the similarly displaced: imperial Romans, Neolithic Europeans, and a small cadre of East Indian peasants.

The Providence Rider is the fourth installment in the extraordinary series of historical thrillers featuring Matthew Corbett, professional problem solver. The narrative begins in the winter of 1703, with Matthew still haunted by his lethal encounter with notorious mass murderer Tyranthus Slaughter. When an unexplained series of explosions rocks his Manhattan neighborhood, Matthew finds himself forced to confront a new and unexpected problem. Someone is trying - and trying very hard - to get his attention.

Young Magdalen and Jesus, brimming with youthful charm and arrogance, find each other and fall in love, forging a bond that is stronger than death. Their pleasure is overshadowed by a brilliant but unbalanced druid who knows a perilous secret about Maeve's past. The prequel to The Passion of Mary Magdalen.

It is 1863, but not the one it should be. Time has veered wildly off course, and moves are being made that will lead to a devastating world war. Prime Minister Lord Palmerston believes that by possessing the three Eyes of Naga he'll be able to manipulate events and avoid the war. He already has two of the stones, but he needs Sir Richard Francis Burton to recover the third.

Boarding a transport ship after the Battle of Gettysburg, Colonel Andrew Keane and his 35th Maine regiment are swept into an alternate world. The first human civilization they encounter on this planet resembles medieval Russia, with boyars and priests ruling over the peasants and townspeople. Soon Keane and his regiment learn this world's terrible secret: that cannibalistic hordes of large, fierce Tugars circle the planet and demand tribute - including humans to be devoured.

After being commissioned to find a rare book, Librarian Irene and her assistant, Kai, head to Prohibition-era New York and are thrust into the middle of a political fight with dragons, mobsters, and Fae.

Even as they mourn the loss of their colleague, psychic Nan Killian, medium Sarah Lyon-White, and Elemental Masters John and Mary Watson must be vigilant, for members of Moriarty’s network are still at large. And their troubles are far from over: in a matter of weeks, two headless bodies of young brides wash up in major waterways. A couple who fears for their own recently-wedded daughter hires the group to investigate, but with each new body, the mystery only deepens. The more bodies emerge, the more the gang suspects that there is dangerous magic at work.

Raybould Marsh, one of "our" Britain’s best spies, has travelled to another Earth in a desperate attempt to save at least one timeline from the Cthulhu-like monsters who have been observing our species from space and have already destroyed Marsh’s timeline. In order to accomplish this, he must remove all traces of the supermen that were created by the Nazi war machine and caused the specters from outer space to notice our planet in the first place. His biggest challenge is the mad seer Greta, one of the most powerful of the Nazi creations, who has sent a version of herself to this timeline to thwart Marsh.

In 1912, history was changed by the Miracle, when the old world of Europe was replaced by Darwinia, a strange land of nightmarish jungle and antediluvian monsters. To some, the Miracle was an act of divine retribution; to others, it is an opportunity to carve out a new empire. Leaving an America now ruled by religious fundamentalists, young Guilford Law travels to Darwinia on a mission of discovery that will take him further than he can possibly imagine.

Ten years have passed since Admiral Kolhammer's 21st-century battlefleet was dragged into a wormhole and thrown across oceans of time, emerging with disastrous consequences and shattering the history of the Second World War.

The invaders are coming; the Posleen, a seemingly unstoppable horde who have conquered one star system after another, literally feeding on their conquests. Earth's dubious allies, the Darhel, have given the humans a number of highly-advanced technological devices, including a process for rejuvenating the aged, including trained and proven soldiers who otherwise would be too old to fight. Rejuvenation may give a critical edge, since to survive, the Earth must use every resource at hand.

In the year 2021 a multinational fleet - experimenting with untested weapons technology - pitched through time, crash-landing in 1942. The world is thrown into chaos as Roosevelt, Hitler, Churchill, Tojo, and Stalin scramble to adapt to new, high-tech killing tools, and twenty-first-century ways of war.