Who's texting you?

A romantic holiday in a Greek paradise was supposed to save Daniel and Šárka's relationship. However, on the very next day, they are taken aback by news of a strange letter waiting for Daniel at the post office, and a week of romantic reconciliation turns into an agonising wait for the mystery to unfold. Who sent it and why, when Daniel denies any connection to the place it was sent from? Can Šárka still trust him after everything they have been through?
Unanswered questions reopen old wounds and deepen the chasm between the partners. Will they be able to start communicating again and continue on, hand in hand, or will their paths in life part for good?