The real bliss and ....

X is a fictional character in a series of children's books by author Astrid Lindgren, 

and adapted into multiple films and television series. X was named by Lindgren's 

then nine-year-old daughter, Karin, who requested a get-well story from her 

mother one day when she was home sick from school. The author Y based the 

character of Z on what he imagined X might have been as an adult. Title is a 

reference to YX,Y and Z?

    - Hrishikesh