Lorelei

Lorelei is a science fiction novel by Charles V. De Vet, written in the early 1960s. It explores themes of isolation and the psychological responses of humanity when faced with dire circumstances, focusing on a group of astronauts stranded on Europa, one of Jupiter's moons. The story features an anamorph, a being that can shape itself according to the astronauts' desires, serving as both a source of comfort and a psychological challenge.