"All Blue Sky" is a novel by the French author Melissa Da Costa, centered around a 26-year-old young man named Emile, who is diagnosed with early-onset Alzheimer's disease. Emile decides to escape the hospital and live the rest of his life his own way, embarking on a journey of self-discovery and searching for meaning in life. He is accompanied on this journey by Joana, a girl who also carries her own internal scars. The journey is filled with encounters with diverse characters and astonishing discoveries, highlighting the importance of love, exploration, and holding onto life in the face of illness challenges.