The book should be used when you found out the correct historical figure, so you can prove the customer is lying. The problem is that it seems the program always shows the artifact being from Egypt when in fact it could be from 2 other places, making it practicly impossible to find the correct historical figure. It's a game breaking bug that we missed. 

Thanks for the feedback, we hope it didn't sour the experience completely.

Every tried to make every object an interaction object and hoped the "?" button would help recognize the purpose of them. Yet I agree that our effort was not entirely successful. Thanks for the feedback.