It was a risk to call her bluff, but one that had paid off. He was right and she had nothing. Zacharias still didn't know where his sister was, but his best guess would be she was en route back to Peebles when mother sent the owl. Whatever the case, there might be words later to figure out exactly what sort of game Marietta was playing at.
There might have even been words for Marietta had she not run off to the loo. Hearing, rather than see it happen, the next words just sort of fell out of his mouth. "Shite, you're not pregnant are you?"
She hadn't looked well yesterday and now getting sick in the morning? Plus didn't hormones make women do all sorts of crazy stuff, which might actually explain her little gambit. And after last night, Zacharias Smith definitely had sex on the brain.