Unclear boundaries

Danger comes from the depths of space. But not from where people would expect it...

A routine mission turns into a tragedy in an instant. The exploration ship G216, which was to study the depths of space, was badly damaged and all but one of its crew perished. Navigator Erin Marthen survived the accident, but fate had a difficult test for her in the form of a creature named Kchrat. A creature with a long tail and a monstrous visage that would put a movie Alien to shame rescues a frightened young woman from the wreckage of her ship and leads her to the secret planet of Shatchra, where Erin meets the first alien civilization. Clearly we are not alone in the universe, but the dangers hidden in its vast reaches could be our species' undoing. So after six years, the astronaut, accompanied by her rescuer, rushes back to the humans to warn them in time. Will they be able and willing to communicate with the alien monsters, or has each side of the conflict set boundaries and refused to compromise?
The first part of the original Czech space opera, set in the 22nd century, deals with the fragile coexistence of two different civilisations.