Lost Book QQ

This is most definately NOT one of good days :/ The only good news I really have is that I found my French textbook. As for my Socials textbook, someone else still has it. I lent it to someone last week and they haven't returned it yet... I forgot who I gave it to cause of my horrible memory and I was in a huge rush that day. I tried asking everyone who might've borrowed it but every single person said NO. QQ Now I have absolutely no possible idea where my book may be... Maybe the person thought it was their own or returned it. All I know is that the person isnt't in Synergy since I remember being quite shocked that another class is using the same textbook. But now I asked everyone I could think of but NOTHING! Doesn't help that my mom is now extremely mad at me and is no way willing to pay for it if I don't find it... I don't have the money to pay for it either. Since the book isn't published anymore is cost is easily over $100... QQ Any ideas on what I should do? QQ