The story of how Blu met Luka and what happened next.

This is the story of a girl called Blu and her four friends: Abel, Tilly, Cameron and Luka. Abel has always been Blu’s best friend; Tilly lives in another city but is constantly video calling her; Cameron is American and has just arrived in town; and Luka doesn't remember how he got there, but has superhuman strength and is invisible.

• A tale of courage, adventure and friendship that thwarts challenges and overcomes the fear of the other.
  

• Elements of adventure, fantasy and coming-of-age writing with echoes of the big screen.
  

• Shortlisted for The Strega Children's Prize.