In 1980s Washington state, USA, Mount St Helens is rumbling.

Twelve-year-old Maribel isn't concerned at first, despite officials evacuating her neighbourhood.

Her family is convinced it's just a precaution, even as the mountain continues to rumble.

Maribel decides to disobey orders and return home for items she and her sister left behind - just as the volcano finally erupts.

As ash rains down, Maribel realizes she must learn to focus if she's going to survive.