My sister-in-law slapped my 5-year-old daughter right across the face on Christmas Eve. My husband begged me “not to ruin dinner.” So I slapped Rachel twice right back, right in front of the turkey, the roast beef, and his entire high-society family. That very night, I sent moving trucks and emptied the house they swore was theirs.

Just for a few months, they had said.

They had been living there for five years.

At 11:40 p.m., Sarah arrived.

She stepped out of an SUV wearing a sequined dress underneath a heavy jacket, her heels in her hand and the look of someone coming to a war, not a party.