The Time Traders II: The Defiant Agents and Key Out of Time

The Stonehenge Gate

Leviathan Wakes: Book 1 of the Expanse (now a Prime Original series)

Short Science Fiction Collection 092 (Unabridged): optional

The Humanoids and With Folded Hands

Star Flight

Caliban's War: Book 2 of the Expanse (now a Prime Original series)

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The Green Girl (Unabridged): optional

Storm Over Warlock

Never Meet Again

Darker Than You Think

The Time Traders

Nemesis Games: Book 5 of the Expanse (now a Prime Original series)

After World's End (Unabridged): optional

Andre Norton: Voodoo Planet: A duel of two cosmic magicians - a horrible death for the loser

The Testaments: WINNER OF THE BOOKER PRIZE 2019

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Clifford Simak: Hellhounds of the Cosmos