When Karl meets Nini from Vienna, he’s convinced she’s the love of his life, but he loses her phone number. All he knows is that she always celebrates her birthday at the famous Café Sacher at 3:00 p.m. He leaves Berlin and heads to Vienna to wait for her every day at the Café. He makes new friends, including the baker, Miriam, and with her, he discovers Vienna while in search of true love.