Yes, I am very aware of the mistakes I made in this situation. As I've stated in other comments, the people I was dealing with were personal friends, and I was naive to think it would not come to this.

I was never an employee, always treated as a freelance independent contractor. I never even received tax documents and was paid from personal accounts.

My reason for posting here was just to get an idea of my legal position before pursuing a lawyer, in case I had no case against this company. Considering that each of the books made 20-30k profit, I think it would be worth it to seek some kind of legal action.

Thank you for your advice.