Digital technologies are increasingly integrated into classrooms and standardized assessments, yet many platforms lack scaffolds to support struggling young adult readers. This study evaluated whether a digital library, ReadEezy, could enhance reading outcomes for this population. Specifically, it evaluated comprehension, retention, and engagement relative to a control (Plain-Text). Participants included 202 struggling high schoolers in Intensive Reading classes; each received one interactive E-Book from the ReadEezy platform and one digital Plain-Text ReadEezy story. Participants self-rated the E-Book higher for engagement and retention than the Plain-Text, but slightly higher comprehension confidence for the Plain-Text. Post-reading summaries revealed stronger comprehension performance in the E-Book condition. Self-reported comprehension, engagement, and retention ratings were all significant predictors of comprehension performance for both versions, though effects were small. Finally, images, embedded questions, and gamification features were predictive of higher comprehension performance in the E-book, suggesting these features may support struggling readers in digital environments.