Claire Bennett was midway through dinner at Romano’s in Columbus, Ohio, when her phone buzzed.

Stuck at Mom’s for dinner. Love you.

Her husband, Evan, had used that same excuse three Sundays in a row. Claire might have ignored it—until she glanced up.

He was three tables away.

Evan leaned in toward a woman in a red dress seated in the back corner of the restaurant. Between them sat two wineglasses and a thick cream envelope sealed with dark red wax. Claire watched as he slid it across the table. The woman brushed the seal, then his wrist.