The Library Kids Cry of the Banshee is book number 3 of 7 in The Library Kids series. The story continues with Scott sneaking into the secret library and going back in time to World War II to visit his grandfather where he trains with him to be a soldier during the war. They end up in the Philippines and the Spirit of Forgetfulness is plotting to hurt Scott and his grandfather and change the outcome of the war. A banshee is sent to warn Katie and tell her she must help bring her friend Scott back home before it's too late. To do so, Katie and her friends must learn about pivotal points of World War II to weaken the Enemy and convince Scott to come back home. The children will have the protection of the Nordic Gods and Goddesses during their journey back in time to World War II. After their war experience, the children continue with the crystal hunt by searching the mysterious ruins on the east coast of America known as America's Stonehenge. They must also travel to the Cave of the Giants in Illinois to retrieve another crystal. Meanwhile, the Enemies attack on the children heats up.