I turned to Nathan, wondering if he would step in and set her straight.

He met my gaze, daring me to refuse.

It was a sad goodbye, but it was better I remembered him as the lovestruck fool he was for Katherine rather than my doting husband.

Katherine's smile was wide when I set her clothes down on a table in the stall.

"I can't imagine losing a sister and husband in the same year." She sighed, dramatically.

"Excuse me?"

"I'm just saying, it's only a matter of time till Nathan gets bored of all the weeping and moaning."

All I could do was stare, wondering what made her act so boldly when, up until that moment, she had been playing the friend role so well.

"Is there something you'd like to say to me, Katherine?"

Katherine took her time putting on her dress and taking a picture in it before she responded.

"I've already said all I need to. Unless you're too stupid to know how a flash drive works."

Realization dawned on me, and I froze.

She knew.

My Private Investigator was the best in the business. He had kept such a low profile not even Nathan had known I hired him, so how could she?

Unless...