I am looking for a book. but i don't remember what it was called.?

[VoidDragon]

i am looking for a book i read a while ago but i don't remember what it was called. it was about a girl who is part of a guild that know how to work with a rare deadly spider and she steals one and uses it to make spider silk. i read it awhile ago so i am not sure about what else it is about but i would really like to know the name