Postmarked the Stars (Solar Queen #4)
Andre Norton
Rated: 3.90 of 5 stars
3.90
· 10 ratings · 192 pages · Published: 1969
Efforts to find out the reasons for the mysterious switch seemed hopeless until they made the ghastly discovery that their precious cargo of alien embyos had been subjected to secret radiation, causing them to regress genetically into monster forms.
Only after Dane and his fellow spacemen had endured a series of nightmare adventures on their port of call did they begin to fit the puzzle together - to realize that they had stumbled upon a criminal operation that involved a whole cluster of stars.