I know there is a lot of keeper of Lost Cities and Percy Jackson crossovers but I've never seen a Percy Jackson and keeper of Lost Cities crossover with any mention of when Sophie was going to go to college in the first book. I think there should be a Percy Jackson and Keeper of the Lost Cities crossover that the Percy Jackson gang finds out that Sophie was going to go to college until she disappeared. I think would be cool to see Sophie's reaction when she finds out that they found out about her going missing and being a 12 senior.