Lately Lily's grandad has been confused and forgetful, but Lily just knows that if she can help Grandad unlock his past, he'll be back to normal.
Then Grandad's memories magically start coming to life and Lily and Grandad travel back to his childhood in Hungary. But they both get more than they bargained for when they get stuck in Grandad's darkest memory....
Can Lily find the light at the end of the tunnel?