While I don't have real-time information on specific book-writing companies in Chicago, I can provide you with some well-known and reputable publishing and literary agencies that operate in Chicago. These organizations have a strong presence in the industry and can guide authors through the book-writing and publishing process. It's important to conduct thorough research and review each best book writing companies services, reputation, and client feedback before making a decision. Here are a few notable book-writing companies and literary agencies in Chicago:

Chicago Writers Studio:

Offers a range of services, including writing workshops, manuscript consultations, editing, and publishing guidance.

Chicago Publishing Network:

Provides professional writing services in editing, proofreading, book design, and self-publishing support.

Stuart B. Levine Literary Agency:

Represents a diverse group of authors in various genres and provides guidance throughout the publishing process.

Golden Wheat Literary:

Offers a range of editorial and publishing services for authors, including manuscript evaluations, editing, and publishing consultations.

Chicago Literary Agency:

Represents both emerging and established authors, offering assistance with manuscript development, submission, and negotiation with publishers.

Loiacono Literary Agency:

Operates out of Chicago and represents authors across genres, providing guidance on manuscript development, editing, and publishing strategies.

Remember to carefully review the services, expertise, and track record of any book-writing company or literary agency before engaging with them. Consider reaching out to multiple companies, requesting information, and comparing their offerings to find the best fit for your specific needs and goals.