Ruby in the Rhine River

Historian Grace Whitmore thought a river cruise
through Europe would bring peace. Instead, she
uncovers a deadly legend —a missing ruby once
guarded by knights and hunted by shadows.
As bodies fall and secrets rise, Grace races through
castles, cathedrals, and crypts to stop a centuries-ola
relic from falling into the wrong hands.
Because history isn't buried. It waits.
And it burns.