A company party. One confession. A marriage that suddenly feels impossible to ignore.

A simple favor turns into the beginning of an impossible confession.

After accompanying your sister-in-law Ana to her company's party, you walk her home, expecting the night to end like any other. Instead, she admits she has been in love with you since the day you met.

The worst part isn't the confession—it's who she is.

Ana is your wife Maite's younger sister, and Maite trusts both of you completely. While you're trying to process everything, your phone keeps lighting up with innocent messages from your wife, asking if everything is okay and when you'll be home.

A single night. One impossible choice. Three lives that may never be the same again.