I never expected my rich daughter-in-law’s fancy dinner invitation to turn into a nightmare.

But when she abandoned me with a $5,375 bill, I knew I had to teach her a lesson she’d never forget — I just didn’t know how it would end.

My name’s Ruth, and I’ve just hung up my chalk after 40 years of teaching.

My son Michael’s wife, Veronica, invited me out to celebrate. She’s this hotshot lawyer, all designer suits and power lunches.

“Don’t worry about the cost,” she said on the phone. “It’s my treat.”

I should’ve known better, but I was so touched by the gesture that I ignored my gut feeling.

Little did I know, this dinner would change everything.

“That’s very kind of you, Veronica,” I replied. “Are you sure?”

“Absolutely,” she insisted. “You deserve it after shaping young minds for so long.”

The restaurant was the kind of place where the menu didn’t have prices.

The maître d’ looked me up and down as we entered, her eyebrow arching slightly at my sensible shoes and department store outfit.

We were seated at a table near the window, overlooking the city skyline. I felt out of place among the crisp white tablecloths and crystal glasses.

“So, Ruth,” Veronica said, perusing the wine list, “how does it feel to be retired?”

I fiddled with my napkin. “Honestly?

A bit strange. I’m not sure what to do with myself.”

She nodded absently, then turned to the sommelier. “We’ll have the 2015 Château Margaux.”

We chatted about family, my old job, her work.

For once, I thought we were bonding.

“You must be glad to be done with all those unruly kids,” Veronica said, sipping her wine.

“Oh, I’ll miss them,” I replied. “Teaching was my life. Each student was unique — a puzzle to solve.”

She nodded, but I could see her eyes glazing over.

When the waiter came, she ordered without even glancing at the menu.

“The usual,” she said with a wave of her hand. “And for my mother-in-law — ” she paused, looking at me expectantly.

“Oh, um, I’ll have the chicken, please,” I said, flustered.

The waiter nodded and disappeared. Veronica launched into a story about her latest court case, barely pausing for breath.

I tried to follow along, but my mind wandered.

I thought about my classroom, now occupied by a younger teacher. Would she care for it like I had?