“Use cash to buy an iTunes gift card so you can download Signal. It’s a private messaging service from the app store. Make this your username.” Reece took a napkin from the table and wrote down a series of random letters and numbers. He copied the same characters at the bottom of the napkin and tore the paper in half, sticking one half in his shirt pocket. He slid the top half across the table to Katie. “It’s basically a texting app. You’ll need cell service to get Signal, so just use a prepaid SIM bought with cash. After that, don’t use cell again. Only use it over public Wi-Fi. Also download
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