Lucky Flynn hasn't spoken to his family in years. When he learns that his mother has only days left to live, Lucky sets off in a hire car to drive the 4,000km from Sydney to Perth to say goodbye.

The two unlikely travel buddies experience a monumental coming-of-age moment as Meg experiences her first ever period. But after changing her tampon in a roadside toilet, she accidentally leaves her purse behind in the cubicle. Officially out of money, Lucky and Meg's day gets a whole lot worse when they run out of fuel as well, just as the local highway patrol is escalating its manhunt in the area for two highly wanted persons.