This study investigates how specific narrative elements, termed narrative depth, influence perceived story quality, transportation, and topic interest in science communication. Using structural equation modelling and experimental group comparisons, we examined the relationships between vivid imagery, protagonist emotions and motivations, and narrative engagement. Results showed that while narrative depth did not significantly impact perceived story quality, transportation emerged as a key mediator between perceived quality and topic interest. Additionally, women and individuals with higher education reported greater transportation and topic interest. These findings provide important insights into factors that influence the potency of stories in the context of science communication.