Reddit reviews Eifelheim

Eifelheim. Can't recommend this book enough.

Eifelheim

Eifelheim is really good. Pretty much anything by Michael Flynn. Similarly, The Book of Feasts & Seasons and anything by John C. Wright.

Edit. Actually now that I think about it the Book of Feasts and Seasons isn't sci-fi at all even though most of what John C. Wright writes is. It is awesome though and very Catholic. For more sci-fi, I'd recommend the Count to a Trillion Series.

I thoroughly enjoyed Eifelheim, about aliens in medieval Europe. It looks at the collision between alien creatures and local religion, and was a great read.

There was a book called Eifelheim, where there were creatures similar to this.
The premise is aliens land in Medieval Europe, and the aliens looked like grasshoppers

Eifelheim by Michael Flynn.

Great from a science-fiction perspective and really shows the author knows his stuff about medieval and church life.

Eifelheim by Michael Flynn

Booklist: In the fourteenth century, the Black Death ravaged Europe. Most towns decimated by it were eventually resettled, except for Eifelheim, despite its ideal location. Mathematical historian Tom discovers this anomaly and an unexpected connection to his domestic partner Sharon's research in theoretical physics, which seems to be leading to a method of interdimensional travel. In fact, as Eifelheim's priest back then, Father Dietrich, relates, before the plague's arrival, an interstellar ship crashed nearby. The encounters between its passengers and the people of Oberhochwald, as Eifelheim was first called, reflect the panoply of attitudes of the time, from fear of the foreign to love and charity for one's neighbors to the ideas of nascent natural philosophy (science), and the aliens' reactions are equally fascinating. Flynn credibly maintains the voice of a man whose worldview is based on concepts almost entirely foreign to the modern mind, and he makes a tense and thrilling story of historical research out of the contemporary portions of the tale.