Another of their prestige products, the Special. Themed covers, with type styles and graphics familiar to all of us who haunted the wire rack of paperbacks at the drugstore. Goodreads:
Suspended in the jade depths of an ancient Earth sea. Chrono-hurled to a steep winter planet swept by an eerie future war. Middle-aged (at 26), tiger-tough (at 4'9"), walking a wild Universe on Time-long legs. This is the story of a woman named Alyx.
Okay, sure. Maybe not the best description? Wikipedia:
"Picnic on Paradise" (1968) presents Alyx as an agent of the Trans-Temporal Authority. Having been accidentally rescued from drowning in the bay of Tyre by a "time-scoop," she is employed to guide a group of ill-prepared vacationers across the treacherous landscape of an alien world.
That's more like it. Part of a series of feminist sci-fi. The Wikipedia article has some other details that suggest how far down the fantasy hole you could go if you were so inclined:
Through her appearances in stories about Fafhrd and the Gray Mouser, Alyx is mentioned briefly in TSR's Lankhmar – City of Adventure (1992), and Mongoose's Fritz Leiber's Lankhmar (2006). Both of these are roleplaying game products.
I'm sure they are.