Cosmic Horror

A lighthouse keeper on a remote island discovers that the waterline is creeping up the shore every night and never coming down, and that the thing the sea is trying to show him is not water.

At an isolated high-desert observatory, astrometrist Viveka Skoglund measures a faint source whose position defies the sky's own geometry, and as her crew quietly changes around her she must choose between her instruments and the people she lives with, at the cost of her own certainties.