Astrid’s first space voyage! It was supposed to be a training voyage, and no one expected enemy action. But an enemy fleet attacks! Captain Jefferson has suffered a breakdown, and the bridge crew is on the verge of mutiny.

Astrid leads an attack on an enemy ship, but peace talks are placed in jeopardy, because the emperor's son had been on board and has been reported killed. Further complicating matters is the suspicion that Amundsen's squad has been jinxed.

Astrid is back, and again she’s serving under Captain Wayne Banning! In Proximity Warning, Astrid and her people board the wreckage of a small spacecraft. They rescue a dying alien whom a powerful enemy has left to suffer the effects of the cold vacuum of space. The new visitor has strange abilities—and she needs Astrid's help in carrying out an audacious plan.

It’s a race against time, as Astrid leads a desperate effort to reach the remnant of Skydock Eight’s crew before they’re annihilated by the enemy. Among the four Navy personnel Astrid’s team needs to save is Whitaker, one of Astrid’s fellow midshipmen from her Annapolis days. But Whitaker may not be who he seems to be. It’s a case of “Who Goes There?” meets Astrid Amundsen, when it isn’t always clear who is human and who is a killer alien.

An alien warship a half mile in length is headed for Mars, intent on annihilating Earth’s fleet in orbit around the Red Planet. Astrid and her people are assigned to the clunky old USS Sidewinder—but they are going to do what they can to even the odds.

Astrid's squad undertakes one of their weirdest missions, as they attempt to make sense of a mysterious little chest made of gold, and the strange artifacts within it.