Recently I have read chapters 37 and 38 of the book The Thief Lord. In chapter 37, Hornet got picked up by Victor and Ida. In chapter 38, Riccio found Prosper and brought him to Ida's house.
I think it's hard to believe that Ida and Victor were able to find and get Hornet from the orphanage because I never knew Ida could lie so well and especially to the people who took care of her when she was young. I think you should read Joey's Blog because I think he did a great job describing in his summary.