A vertical, character-focused book cover for 'The Unforgotten Summer' with a double exposure effect blending the glowing faces of five young friends with the lush golden-hour forest scene of Clover Hollow. The characters' semi-transparent faces convey wonder and excitement as they reflect their emotions. Emma (12, female): Light brown ponytail, wearing a striped shirt and denim shorts, holds a glowing vintage locket; Aria (11, female): Dark curls, wearing a yellow sundress, gazes curiously; Finn (12, male): Sandy blonde hair, wearing a green t-shirt, holds a faded note signed 'L.J.'; Reed (11, male): Short dark hair, glasses, wearing a blue hoodie, smiles warmly; Kai (10, male): Black wavy hair, wearing a red t-shirt, holds a flashlight emitting soft light. The double exposure effect seamlessly merges the rustic shed adorned with clover garlands, hand-painted signs, and a glowing lantern into the characters, creating an ethereal, magical feel. The forest, bathed in golden sunlight, intertwines with the expressions and items held by the characters. At the top, the title 'The Unforgotten Summer' is displayed in bold font, with the subtitle: 'Uncover the Secrets of Clover Hollow: A Heartfelt Journey of Friendship, Mystery, and the Adventure of a Lifetime.' At the bottom, the author’s name, Rosemary Whitethorn, appears in elegant script. High detail and vibrant colors highlight the emotional depth and magical atmosphere.