A stained-glass window. A dead winemaker. A secret buried for seventy years.

When Charles Forrester is found dead at his Missouri winery, there appears to be little mystery about how he died. But questions about the man himself soon emerge. Charles Forrester, it seems, had spent much of his life hiding his past.

A stained-glass window from that past contains a puzzling alteration—and a clue pointing to the tiny Czech village of Podhradka. What begins as curiosity about an old window uncovers a hidden identity and a trail leading back to the darkest years of World War II.

Following that trail to the Czech Republic, journalist Leni Spencer joins a German professor on a quest to discover what happened in Podhradka decades ago. But finding answers means bending a few rules. Before long, they are trespassing in a locked church, scrambling through the ruins of the past, and doing their best to avoid arrest in a foreign country.

What they uncover has been hidden for generations—and could finally answer questions no one knew to ask.

The Clue in the Window is the fourth book in Katherine Bennett’s Heartland to Hometown Mysteries, where journalist Leni Spencer has learned that history has a troublesome habit of refusing to stay buried.