We provide design services. We do not proofread text, edit references or index entries, and we do not run spellchecks, or grammar checks. Ensuring your text is correct is certainly important but it is very different work. If you would like recommendations for good proofreaders, editors or indexers then we can provide these.
We do however run typographic checks to make the styling of the text consistent. This means we ensure headings have consistent casing, check that “quotation” marks come in pairs, that all sentences end with punctuation. And all punctuation is followed by a single space. There are also a few more fussy things specific for books, such as converting double hyphens — to en dashes —, converting dots … to proper ellipses … and using italics rather than spot underline or bold for emphasis.