Surprised by the sudden appearance of La Pentera and her men in the lost mine city, Hop, Tank and Christopher Cross found refuge in the winding tunnels of the temple, but the clever foreign agent followed in close pursuit. The last time, the boys were seemingly trapped in a dead-end tunnel, and so ordering Tank and Chris to stay where they were, Hop sprang suddenly forward, charged through the enemy shouting orders in an attempt to fool her - and she gave chase - but as Tank and Chris waited anxiously, they heard two shots...