Hey Nicholas 
,
This has been a highly requested feature. Right now, our API enrichment step will error out if an ID is passed that does not match Google Books. Parabola cannot skip over these rows and show them as errors.
Try using a “Pull from an API” step to perform a GET request to search books by title. If the API returns Book IDs, you can use a “Find overlap” step to find non-matching IDs from the API against Book IDs from your original data source.
Feel free to upvote that feature request so we can bring more visibility to the thread!