User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-202.156.13.10-20121112141619/@comment-3146930-20121118205703

If anything, it is the other way around. Rick has made a lot of refernces to the Percy Jackson/Heroes of Olympus series during the Kane series, but there has been no references to the Kane series in the PJ/HoO series, or at least none that are really obvious. Because of this, it seems that the Greek/Roman gods are so powerful that they bleed into Rick's other series. As far as a crossover, Rick has stated that the two worlds should be kept apart.