Once - Once Series, #1

Her first and also her once. Jonathan and Rebecca's paths cross at exactly the right moment, when each most needs to hear what the other has to say. But Jonathan is three days from entering the priesthood, and Rebecca leaves him to his peace. But he is unable to find peace. Without each other's comfort and strength, they must each struggle to forge a new path, with only memories of the one day that changed everything.
But are they able to forget and let go?