For Your Eyes Only by Kris Gonterman
Samantha Reilly has run afoul of a secret society, one that she was never supposed to know about. She accidentally joined because the envelope came addressed to her, well sort of. She is now on the run, trying to stay one step ahead of the Society. And trying to find the true person this was meant for, the person she was named after, her uncle Sam J. Reilly. The only way she can track him is through the postmarks on the envelope she received, the first of which was from 25 years ago. Sam hasn’t been heard from since. Samantha has no idea where this journey will lead her, but she has to keep going, because even though the paper says for your eyes only, it wasn’t meant for her eyes.