Still reeling from the discovery of her twin sister, Olivia struggles to face her mother's betrayal. As Olivia and her friends seek to unravel the dark mystery of how and why the twins were separated, tensions escalate when Emma runs into her sister's ex—who assumes she's Olivia. When honesty is abandoned for more secrets and lies, the fallout between the sisters only intensifies. As they sift between truth and deception, it becomes clear that matters of the heart are not as transparent as they may seem.

A page-turning mystery laced with romance and emotional drama, Through the Glass is the satisfying conclusion to the Window Series duology by Erica Kiefer.