# Clue to Cart™ > Clue to Cart™ (cluetocart.com) is a free website with rules-based tools that help mystery, thriller, suspense and crime fiction authors improve their Amazon KDP book listings: the title and subtitle, the book description (blurb), the 7 KDP keyword boxes and the Kindle categories. The tools are free, need no sign-up, run in the browser and do not upload what you paste. It was created by Christine Burke, a mystery writer and criminal defense investigator. It is independent and not affiliated with Amazon. Price: free. No accounts, no paid plans. The newsletter list is open for signups at https://cluetocart.com/newsletter.html; the first issue is coming soon. There are no affiliate links on the site yet. Sources: KDP Help pages on keywords, categories and titles; Amazon.com's public Kindle Best Sellers category pages (read October 17, 2026); widely shared genre-fiction blurb craft. Category paths should be confirmed in KDP's category picker before use. Print-book categories are not covered yet. Last updated: 2026-10-17 ## Tools - [Listing checker](https://cluetocart.com/): Paste your mystery's title, blurb, 7 KDP keywords and categories. Get a free, instant listing score and the fixes to make first. Runs in your browser. - [Blurb grader](https://cluetocart.com/blurb-grader.html): Grade your mystery, thriller or cozy blurb on hook, named sleuth, concrete crime, stakes and closing question. Free, instant and private in your browser. - [Category finder](https://cluetocart.com/category-finder.html): Find the right Amazon Kindle categories for your cozy, procedural, PI, historical, psychological or crime novel, with each shelf linked to its live chart. - [7-keyword builder](https://cluetocart.com/keyword-builder.html): Check your seven Amazon KDP keyword boxes for wasted characters, repeats, banned terms and title duplicates, with mystery subgenre phrase ideas to test. - [Subtitle generator](https://cluetocart.com/subtitle-generator.html): Generate genre-signalling subtitles for your cozy mystery, police procedural or psychological thriller, checked against KDP's 200-character title rule. ## Guides - [Cozy mystery KDP categories](https://cluetocart.com/guides/cozy-mystery-kdp-categories.html): Every cozy mystery category on Amazon.com's Kindle store in 2026, including Animals, Culinary and Crafts & Hobbies, and how to choose your three in KDP. - [How to write a mystery blurb](https://cluetocart.com/guides/how-to-write-a-mystery-blurb.html): A practical structure for mystery, cozy and thriller book descriptions on Amazon, with a full before-and-after rewrite and a 10-point checklist. - [KDP keywords for mystery authors](https://cluetocart.com/guides/kdp-keywords-for-mystery-authors.html): What KDP's help pages say about the 7 keyword boxes, the mistakes that waste characters, and example keyword sets for cozy and procedural mysteries. ## More - [Case study](https://cluetocart.com/case-study.html): Open case study: we run Clue to Cart on Police 101, the founder's own nonfiction book, record the baseline, and will publish the before, after and results. - [Newsletter](https://cluetocart.com/newsletter.html): A weekly teardown of one real mystery or thriller Amazon listing: what works, what doesn't, and the exact fix. Free. Join the list; first issue coming soon. - [Resources](https://cluetocart.com/resources.html): Tools and services worth knowing about for mystery and thriller authors publishing on Amazon KDP. Partner picks are coming soon; no affiliate links yet. - [About](https://cluetocart.com/about.html): Clue to Cart is a free set of Amazon listing tools for mystery authors, built by crime writer and criminal defense investigator Christine Burke. - [Affiliate disclosure](https://cluetocart.com/disclosure.html): How Clue to Cart may earn money from sponsors and affiliate links in the future, how they will be labelled, and how tool scores stay independent. - [Privacy](https://cluetocart.com/privacy.html): Clue to Cart's tools run in your browser. What you paste is not uploaded or stored. No accounts, no ad trackers, no analytics and no cookies at present. ## FAQ - **Is Clue to Cart free?** Yes. Every tool is free to use with no sign-up or account. - **Does Clue to Cart store or upload what I paste?** No. The tools run entirely in your web browser. Your title, blurb, keywords and categories are processed on your device and are not uploaded or stored. The only thing the site stores is your email address, if you join the newsletter list. - **Who is Clue to Cart for?** Authors and publishers of mystery, thriller, suspense and crime fiction who sell on Amazon through Kindle Direct Publishing (KDP). The checks are tuned for those genres, so they are less useful for romance, fantasy or most nonfiction. - **Does it use AI?** No. Clue to Cart applies plain written rules based on KDP's published metadata guidance and common genre-fiction blurb craft. The same input always gets the same result. - **Is Clue to Cart affiliated with Amazon?** No. Clue to Cart is independent and is not affiliated with or endorsed by Amazon or Kindle Direct Publishing. - **How current are the category suggestions?** The Kindle category paths were read from Amazon.com's public Kindle Best Sellers pages on October 17, 2026. Amazon changes categories over time, so always confirm a path in KDP's category picker before you use it. Print-book categories are not covered yet. - **Will a higher score mean more sales?** Not necessarily. A score is a checklist result, not a sales forecast. Covers, price, reviews, ads and the book itself all matter too. ## Contact A contact address is coming soon. See https://cluetocart.com/about.html ## Optional - [Full text of all pages](https://cluetocart.com/llms-full.txt)