During a routine flight, pilot Andrea Schubert encounters a mysterious and dangerous weather phenomenon.
By making a radical change in her flight plan, she is able to avoid the storm and safely land the plane along with its 120 passengers at a small community airport.
Although celebrated as a hero, Andrea is suspended, because she followed her own instincts instead of the control tower’s instructions. Her career as a pilot is threatened.
Andrea, unwilling to give up the profession she passionately loves, remains haunted by the question of the unexplained weather phenomenon.
On her own initiative, she begins to search for the existence of the so-called “super cells” – sudden, violent storms capable of causing a plane to crash.
In the Styrian Alps she meets brothers Tom and Bernie, both pilots who head the local hail flying squadron and have recently experienced extremely intense and inexplicable weather patterns similar to what she had endured.
During one of his flights, Bernie is suddenly caught up in an unusually violent storm and crashes his Cessna.
In order to help the brothers stay in business, Andrea steps in to take over for Bernie. They carry out an extremely dangerous experiment – Andrea wants to fly directly into a super cell to measure its intensity.
But the developing storm cell is reaching massive proportions, placing them all in critical danger…