""You are in danger as well...Please heed my warning..." "

So begins the diary written by Catherine Morgan as she describes the events of a Monday in 1810 Regency England. When another Catherine Morgan, who lives in present-day New York City, receives the diary, she is drawn into the mystery as the present Monday begins to resemble the Monday in 1810.

Writing in the diary, Catherine pleads for help by hinting this particular Monday can be changed as long as the day doesn't end the same way. Catherine and her brother XJ desperately try to unravel the clues from 1810, but this is...