Last Flight of the Snowbirds

Lying within the bowels of a deep dark Arizona canyon there is a very dark secret,- - -. What these Snowbirds discover there will take them on a very dark journey down the road to perdition. But even with the devil himself in pureuit, they come full circle and come face to face with pure evil and an opportunity for redemption.
But will they win out in the life or death struggle against the powerful forces of unbelievable evil,- - - -?