"When My Heart Felt Volcanic" is a young adult novel by Lindsay Eagar that explores themes of love, friendship, and self-discovery. The story follows a teenage girl named Maggie who navigates the complexities of her emotions and relationships while dealing with the challenges of growing up. Set against a backdrop of vibrant imagery and metaphor, the narrative uses the concept of a volcanic heart to symbolize intense feelings and the struggle to express them. As Maggie learns to embrace her passions and vulnerabilities, she embarks on a journey of personal growth and understanding.