This is a nice old-fashioned romantic sf-adventure. Ruth Thalia Adams, aka Alia is on the run from the Galactic Transit Authority, which operates a subspace subway system that we Earthlings literally fell into. Alia, who looks and acts like a Greek goddess, meets classics professor Peter Ward at a ruined temple to Aphrodite. They make mad, passionate love, and Peter learns that Thalia won a fortune as a diamond prospector on Nuerth, a colony world reluctantly granted to Earth by the stuffy Auld, who run the Transit Authority.
Anyway, Thalia goes on, twitting the staid Auld rulers, especially the Galactic Marshall who's hot on her tail. Revelations ensue that won't surprise the experienced reader, but it's a likeable book with likeable (if two-dimensional) characters -- though Thalia/Alia can be pretty cold-hearted.
This is one of two Llewellyn novels published posthumously (he died in 1984). He's been almost forgotten, but if you have a taste for old-fashioned romantic SF, "Fugitive" wouldn't be a bad place to start.
2017 reread notes: didn't hold up particularly well to a reread, so I'm knocking it down to 3 stars. Not really a keeper, but if you come across a copy.....
Not a GREAT book, but one that held my interest enough to see it through to the end. There are some unexpected twists right up to the last few pages, as well as a few disappointments in the way some characters turned out. In the end, I would rate it on the positive side of average.