i remember this movie serial a a boy in the thirty and we would ask our mother for a penny on a wednesday after school and and line up at the local movie house along with hundred of kid . mostly boys and it always promise fast action and the mystery squadron who have their hideout in a mountain cave and the black ace the leader always seem a though he would never would be reveal and would provide the bad deed and a the action heat up thousand of young foot would stomp on the balcony floor and it be a wonder that it never collapse . it would build to a crescendo and then it would stop suddenly and everyone would hold their breath a the hero would be put in seemingly inescapable peril and next week . see the next thrilling chapter and we would pile outside still grip in the spell and discus with action what have take place and we would then speculate a to how he be go to get out of this late fix and bob steele and tom mix and hoot gibson and buck jones and ken maynard and our hero and who never kiss a girl and in our game no one want to play the black ace . happy innocent day .