Alan Baker has written a helpful and somewhat critical review of my Cambridge Element on Mathematics and Explanation. One issue that Baker pursues at some length concerns how to formulate a model for inference to the best explanation (IBE) that helps both the scientific realist to support their claims to know about unobservable entities as well as the platonist to support their claims to know about platonic entities. In the Element I develop what I take to be an important challenge to this combination, but Baker raises some valuable objections. This is hopefully a debate that can be continued!