Hi, I am struggling to entertain a restless child this holiday. He has read all of Phillip Pullman’s His Dark Materials and Book of Dust books since more than a year ago and loved them. Since then, I have been struggling to find books he likes. His reading ability is above average but not ready to transition to books with romantic themes yet as he says they are silly and senseless. The last book he read and loved was Surely You're Joking, Mr. Feynman! Any suggestions will be appreciated, but nothing with substantial romantic themes.