Professor Nicholas claims to be a man of science, but that might change after he and his wife take their five adopted children (A.J., Adam, Rachel, Allison and Cinnamon) on a trip into outer-space. The space travelers journey takes them to two distant planets. One of the planets is yellow and the other one looks much like Earth. The five children and Mrs. Nicholas cant explain it, but they feel strangely drawn to the yellow planet. To their amazement the yellow planet draws their ship the Star Clipper towards it. After landing on that yellow planet, the Professor, his wife and children are soon caught up in an adventure. Part of this adventure takes place on the yellow planet which they learn is named Willow Weath. The other part of their adventure leads them to the earth-like planet. It is known as Tellus. Both planets are involved in a crisis. Nomis, the Head Servant on Willow Weath, is the one who sends the visitors and three helpers (Brandon, Anissa and Ann) to Tellus. While the adventurers are there, they find out just how serious the situation is. During their time on Tellus the travelers out run the agents of the evil Queen Ragnus onboard the submarine Dawn Star. The Nicholas then return to Willow Weath where they and the three helpers set out on a quest. Along the way they learn how the Trio: Sum, Crio and The Rider on the Clouds are always with them. However, as the family proceeds down the trail a foul being known as Mr. Furis tries his best to convince them otherwise. While on Willow Weath the adventurers stay in a tree castle. They also travel through an enchanted forest, a quarrelsome village, a dreary desert, a dark terrifying valley, fight a fierce battle, and climb a lofty peak. Along the path, the earthlings meet many people and learn many lessons. Are they the fulfillment of The Prophecy of The Seven, will they be successful in delivering the Mourning Stone to its proper home?