Sea-Horse In The Sky by Edmund Cooper
A group of passengers, on a flight from Stockholm to London, awake to find themselves on an alien planet, with no memory of how they got there. On exploring their surroundings, they find they are also sharing the world with a group of medieval humans and a stone-age tribe. They join forces and send out an expedition to determine who or what has abducted them and why.
If you like a bit of mystery in your reading as well as sf, then you may well enjoy this short novel. The majority of the book is devoted to the characters’ search for answers to their predicament: Where are they? Why have they been kidnapped? Who is behind it all?
There’s not much to get your teeth into until the final section, where the answers are revealed and the story takes a more high concept, science fictional twist. Until then, you will have to cope with cardboard thin characters and an attitude to women more at home in the 1950s than the late 60s/early 70s, when the novel was published.
Nothing special about this book — read it if you like a bit of a mystery, otherwise there’s nothing to recommend moving it higher on your ‘to be read’ list.