I signed a contract with a publisher and paid them $6250. As the author I will do 100% of the marketing to get only 20% of the profits. I want out.

Under Art. 6, section 6.5 Either author or Publisher (under VA laws there) may terminate this agreement upon mutual agreement of the parties by 30 days'' advance notice in writing. The book designer has not entered the final manuscript edits (I''m invoiced another $1495) or corrected the front and back cover more $$ yet. No product has been produced, and I will not provide more information or authorize completing the project. I can market/sell only 400 copies to recoup my initial investment and retain control over translated copies, etc. I do the marketing work and give them 80% of the profits from my intellectual property. I own a small publishing company "S" corp., and an account with a major print-on-demand company owned by a major book distributor to do business with directly. Can I sever the contract and publish this title (or modify it a little) on my own and protect my intellectual property from them or their means to publish and profit? They can keep my $6250.