Poul Anderson was a science fiction grand master, as awarded by fellow writers of the genre. He had a distinguished career, but sadly this isn't one which wins awards. A good space opera though, fine entertainment yet lacks the certain element which gives it exuberance, and would separate the novel from the ordinary. Nevertheless the story flows and the ships float in the vast, unending, outlandish universe and never fatigues the reader. The obvious reason this is not a prodigious yarn is because the writer's two short stories are fused together, a fix-up in order to manufacture an epic. Still the material needs a better plot, just aliens who look like giant cats the Kzin, with sharp claws and vicious tempers, having an enormous appetite for human flesh but quite intelligent. Robert Saxtorph lives on an asteroid turned into a small planet Tiamat, circling Alpha Centauri A, the nearest star system (of three luminous gaseous bodies) to our own Old Sol, 4 light years away. Though a thirty mile long object in length , a Kzin finds and attacks this would -be hero Mr. Saxtorph and narrowly escapes extinction, however being a veteran of the recent Man-Kzin Wars he is an able warrior , but something is rotten in the state of Kzin...where have I heard that phrase before? Adventures of deep space soon commences as the spaceship Rover splashes and streaks in faster- than -light speed, the eerie, still constantly changing, through the eons of space, roaming its unworldly regions, with a tight group of eight passengers led by Captain Robert and wife Dorcas explore. Part one called Iron , has Laurinda Brozik, her search for a red dwarf star and planet Prima orbiting it, with many moons and she has plenty of money to spend, yet wants to discover more wealth there. The unwanted Kzins arrives to make it interesting... Part two called appropriately Inconstant Star , is another voyage funded by Tyra Nordbo the daughter of a convicted traitor Peter, trying to exonerate him and maybe the long lost man, found . Surprise, surprise, the Kzins come back. Second thoughts, maybe not such a bad book. If you are a fan this will suffice indeed.