"Dear Luke, First let me say I love you I didn t want to leave you. "

Luke Richardson has returned home after burying Natalie, his beloved wife of sixteen years, ready to face the hard job of raising their three children alone. But there s something he s not prepared for a blue envelope with his name scrawled across the front in Natalie s handwriting, waiting for him on the floor of their suburban Michigan home.

The letter inside, written on the first day of Natalie s cancer treatment a year ago, turns out to be the first of many. Luke is convinced they re genuine, but who is...