The adult siblings Juliane and Sarah are inseparable - especially the sensible Juliane still sees herself as the protector of her younger sister, who was seriously ill as a child. But the close relationship between the two women is put to the test when the charming Philipp shows up to spruce up the bookshop where Sarah works. From the first moment, the vivacious Sarah is hooked on her new boss. What she doesn't know: Juliane has also fallen in love with Philipp.