Emily and Stan pack up the RV and head to Boston for some R & R with the grandkids and a chance to immerse themselves in colonial history. But their Fourth of July celebration comes to an abrupt halt when they stumble over a body on the Boston Esplanade and then another hanging in the steeple of the Old North Church. Now the couple must unravel a tangle of forged clues and flush out the perpetrator before their own untimely epitaphs are written onto the historical landscape.