Sophie Masson 
Crystal Heart [EPUB ebook] 

A girl in a tower. An underground kingdom. A crystal heart split in two, symbolising true love lost . . . When Kasper joins the elite guard watching over a dangerous prisoner in a tower, he believes he is protecting his country from a powerful witch. Until one day he discovers the prisoner is a beautiful princess — Izolda of Night- who is condemned by a prophecy to die on her eighteenth birthday. Kasper decides to help her escape. But their hiding place won’t remain secret forever. Will they find their happily ever after?’A deftly woven tale of warring kingdoms and the redeeming power of love. Another winner from Sophie Masson.’ — Juliet Marillier, author of the Shadowfell series