Irza

The fantastic story where the main character worked as the courier on all galaxy.
It was asked about the help in one business. The girl and an animal similar to a cat joins it. They fly on a galaxy and try to resolve secret which appeared long ago.
Action happens after war between races which live in this galaxy.
They even meet arachnoid beings who live in other galaxy.
The main character participated earlier in war which was in a galaxy.