The Ankh-Morpork Post Office is running like...well, not at all like a government office. The mail is delivered promptly. Postmaster General Moist von Lipwig, former arch-swindler and confidence man, has exceeded all expectations - including his own. So it's somewhat disconcerting when Lord Vetinari summons Moist to the palace and asks, "Tell me, Mr. Lipwig, would you like to make some real money?"

The world will end on Saturday. Next Saturday. Just before dinner, according to The Nice and Accurate Prophecies of Agnes Nutter, Witch, the world's only completely accurate book of prophecies, written in 1655. The armies of Good and Evil are amassing and everything appears to be going according to Divine Plan. Except that a somewhat fussy angel and a fast-living demon are not actually looking forward to the coming Rapture. And someone seems to have misplaced the Antichrist.

Somewhere on the frontier between thought and reality exists the Discworld, a parallel time and place which might sound and smell very much like our own, but which looks completely different. Collected together for the first time are seven full-cast BBC Radio dramatisations of Terry Pratchett’s novels, with star-studded casts including Martin Jarvis, Sheila Hancock, Anton Lesser, Philip Jackson, Alex Jennings and Mark Heap.

Seconds before the Earth is demolished to make way for a galactic freeway, Arthur Dent is plucked off the planet by his friend Ford Prefect, a researcher for the revised edition of The Hitchhiker's Guide to the Galaxy who, for the last 15 years, has been posing as an out-of-work actor.

Richard Mayhew is a young man with a good heart and an ordinary life, which is changed forever when he stops to help a girl he finds bleeding on a London sidewalk. His small act of kindness propels him into a world he never dreamed existed. There are people who fall through the cracks, and Richard has become one of them. And he must learn to survive in this city of shadows and darkness, monsters and saints, murderers and angels, if he is ever to return to the London that he knew.

A storm. Rain-lashed city streets. A flash of lightning. A scruffy lad sees a girl leap desperately from a horse-drawn carriage in a vain attempt to escape her captors. Can the lad stand by and let her be caught again? Of course not, because he's...Dodger. Seventeen-year-old Dodger may be a street urchin, but he gleans a living from London's sewers, and he knows a jewel when he sees one. He's not about to let anything happen to the unknown girl - not even if her fate impacts the most powerful people in England.

Roundworld is in trouble again, and this time it looks fatal. Having created it in the first place, the wizards of Unseen University feel vaguely responsible for its safety. They know the creatures that lived there escaped the impending Big Freeze by inventing the space elevator - they even intervened to rid the planet of a plague of elves, who attempted to divert humanity onto a different time track. But now it's all gone wrong - Victorian England has stagnated, and the pace of progress would embarrass a limping snail.

The Western Front, 1916. Private Percy Blakeney wakes up. He is lying on fresh spring grass. He can hear birdsong and the wind in the leaves. Where have the mud, blood, and blasted landscape of no-man's-land gone? For that matter, where has Percy gone? Madison, Wisconsin, 2015. Police officer Monica Jansson is exploring the burned-out home of a reclusive - some say mad, others allege dangerous - scientist who seems to have vanished. Sifting through the wreckage, Jansson find a curious gadget.

Thirteen-year-old Mau is the only one left after a giant wave sweeps his island village away. But when much is taken, something is returned, and somewhere in the jungle, Daphne - a girl from the other side of the globe - is the sole survivor of a ship destroyed by the same wave.

This is a tale of sorrow, a tale of survival, a tale of one man's search for meaning in his universe, and how that search, and the indomitable will that drove it, gave birth to a legend.

For a thousand years the ash fell and no flowers bloomed. For a thousand years the Skaa slaved in misery and lived in fear. For a thousand years the Lord Ruler, the "Sliver of Infinity," reigned with absolute power and ultimate terror, divinely invincible. Then, when hope was so long lost that not even its memory remained, a terribly scarred, heart-broken half-Skaa rediscovered it in the depths of the Lord Ruler's most hellish prison.

It's a simple story. Boy finds proof that reality is a computer program. Boy uses program to manipulate time and space. Boy gets in trouble. Boy flees back in time to Medieval England to live as a wizard while he tries to think of a way to fix things. Boy gets in more trouble. Oh, and boy meets girl at some point.

Neal Stephenson is a blazing new force on the sci-fi scene. With the groundbreaking cyberpunk novel Snow Crash, he has "vaulted onto the literary stage." It weaves virtual reality, Sumerian myth, and just about everything in between with a cool, hip cybersensibility - in short, it is the gigathriller of the information age.

Geralt of Rivia is a witcher. A cunning sorcerer. A merciless assassin. And a cold-blooded killer. His sole purpose: to destroy the monsters that plague the world. But not everything monstrous-looking is evil, and not everything fair is good...and in every fairy tale there is a grain of truth.

There's a reason We Are Legion was named Audible's Best Science Fiction Book of 2016: Its irresistibly irreverent wit! Bob Johansson has just sold his software company for a small fortune and is looking forward to a life of leisure. The first item on his to-do list: Spending his newfound windfall. On an urge to splurge, he signs up to have his head cryogenically preserved in case of death. Then he gets himself killed crossing the street. Waking up 117 years later, Bob discovers his mind has been uploaded into a sentient space probe with the ability to replicate itself.