"Her Favorite Color Was Sunshine Yellow" by Amanda Karch is a poignant novel that delves into themes of grief, love, and self-discovery. The story centers around a young woman named Quinn, who is grappling with the sudden loss of her sister, Lily. Lily was the vibrant, sunshine-yellow presence in Quinn’s life—a source of warmth, light, and endless positivity. Her unexpected death leaves Quinn shattered, struggling to navigate the world without her sister's guiding presence.

As Quinn tries to process her grief, she becomes obsessed with understanding the color yellow, which was Lily's favorite. She begins to see yellow everywhere, from flowers to sunsets, as if Lily is sending her messages through the color. This fixation leads her on a journey to uncover the deeper meaning behind the color and its significance in her life and her sister's.

Quinn's journey of healing is intertwined with her relationships with those around her—her distant mother, her supportive best friend, and a new love interest who challenges her to open up and embrace life again. Through these connections, Quinn slowly learns to confront her pain and find solace in the small, everyday moments that bring her joy, just as her sister did.

The novel is rich with vivid descriptions, particularly of the color yellow, which Karch uses as a symbol of hope and renewal. As Quinn begins to heal, she finds herself painting her own life with the vibrant hues of yellow, transforming her grief into something beautiful and life-affirming.

Ultimately, "Her Favorite Color Was Sunshine Yellow" is a story about finding light in the darkest of times and the enduring power of love and memory. It's a heartfelt exploration of how we carry the people we’ve lost with us and how they continue to shape our lives, even after they’re gone.