Book 1

Time Traders

by Andre Norton

Published 31 December 1978
Time Traders

Book 3

The Defiant Agents

by Andre Norton

Published 1 January 1979
Operation Cochise: a carefully planned Western move to colonize a planet ahead of the Russians. Travis Fox had been an eager volunteer, but the morning he dragged himself half-conscious from the wrecked spaceship on the planet Topaz, he sensed the terror which would threaten the project. Travis never learned why the ship had crashed, nor why he and the other Apache agents had been shot into space without warning. But he quickly finds that the Russians already had a horde of barbaric Mongols on the planet. Now if Travis can't unravel the secret of the eerie underground chamber in the towers hidden in a valley of mist, both Topaz and Terra could be destroyed.

Book 4

Key Out of Time

by Andre Norton

Published 12 December 1978
Sent from Terra to probe the past of the deserted planet Hawaika, Time Agents Ross Murdock and Gordon Ashe are startled when murky underwater pictures of ancient races locked in a fierce battle for supremacy suddenly appear on their time-probe. Despite prophetic warnings of Karara, a Polynesian girl, the Agents decide to invade the past and uncover the secrets of this barren, lotus world.

NO. 1 OF 2

Echoes in Time

by Andre Norton and Sherwood Smith

Published 13 November 1999
Time agents Ross Murdock and Eveleen Riorden are recalled from their honeymoon to take part in a dangerous assignment: find a team of Russian scientists that has vanished without a trace from a distant planet.

Atlantis Endgame

by Andre Norton and Sherwood Smith

Published 20 December 2002
Nobody knows exactly what happened to the fabled civilisation of ancient Atlantis. Was Atlantis, the incredibly advanced society of legend, destroyed by some superscience device than ran out of control? Did a massive earthquake or volcanic eruption sink the island nation? Or is Atlantis merely a cosmic joke played by ancient historians on gullible theorists millennia afterward?