Boxes, bottles, cans. Garbage. Abandoned, ignored, inert. Until nightfall. Slim is a resigned cardboard box. but his fate changes when a kid toy box, Spark, involves him and his pals in an adventure that will change their life forever.

Mary O'Hara, a 12-year-old Dublin schoolgirl, accompanies her dying Granny on a road trip to the past. They are guided by the ghost of Granny's mother and accompanied by Mary's mother, Scarlett. The journey involves four generations of women, with one dead, one dying, one driving, and one just starting out.