The story emphasizes how imagination can be a powerful coping mechanism, especially for children facing trauma and uncertainty. Hazel creates "Whisperwood" for Flora, a shared fantasy world that offers them escape and solace during the turmoil of war. This theme explores how imagination can shape our reality, influence our memories, and ultimately provide a source of strength and hope.

Both Hazel and other characters grapple with secrets and unspoken truths that have lingered for years. The disappearance of Flora hangs over Hazel, shaping her decisions and relationships. This theme delves into the complexities of family dynamics, the burden of guilt and regret, and the healing that can come from confronting the past.

Hazel's journey is not only about finding her sister but also about rediscovering herself. The reappearance of the "Whisperwood" book forces her to confront her past, reevaluate her choices, and ultimately seek closure. This theme explores the universal human need to understand our past, find our place in the world, and reconcile with loss and uncertainty.