Rex has gone to stay with his godfather, Sparky. Rex doesn't say much but that's OK because Sparky is always on hand with a cup of tea to enjoy on the sofa, set up outside like an outdoor living room. Rex has his sketchbook, and he draws how he feels even if he doesn't talk about it. And in Sparky's garden, hidden under the canopy of the willow tree, is the Dream House: a lovingly created space just for Rex, to dream, to play, to think, to be. A place he's loved all his childhood. But to go inside now Rex must summon his strength for revisiting the ghosts of his past.