MY HANDS SHOOK as I hit the button to call her number. It went straight to voice mail. No! “Jesse, what’s wrong? Who was that?” Violet asked. “My mom.” “What?” Violet jumped up and came over to look at my phone. “Oh, my God! What do we do?” “I-I don’t know. It’s going to voice mail again.” “If her GPS is on, you can track the phone,” Violet said. I stared at her. Track the phone. I could track the phone. “God, I’m so stupid.” I took off for the office. Why hadn’t I thought to do that when they went missing? My parents always kept their GPS on, and even if the phone was turned off, it would show the GPS location of the last call. I’d thought Mom had butt-dialed me, but what if she had been letting me know how to find them – and I’d failed her? The computer already had an app inst