Mara has it all. She's a lawyer in a successful practice, has a wonderful husband and a beautiful adopted daughter. Her husband started to notice changes in his wife's behavior. He tries to tell her, but she is in denial. She finally sees what her family sees and goes to a doctor who diagnoses her with Huntingtons, an incurable disease.
Then we have Scott, who is a middle school teacher, who has agreed to take care of a former student's little brother for a year while their mother is in jail.
The two characters are connected by a website and even though share their thoughts to each other, have never met.
The 5 days left is a character in itself. Mara decided to commit suicide because she feels she does not want to be a burden. At the beginning of the book, she gave herself 5 days to get her life in order for when she is gone.
Scott, has 5 days left when he has to return his foster son back to his mother.
I will not share the ending. That is for each reader to experience on their own.