One in a series of stories that introduce a period of history and a geographical location through the adventures of twins. Here, cave twins Firetop and Firefly take us to prehistoric times when man was a hunter and wore the skins of animals.

Traveling with their uncle to Bolivia sounded like fun. But when Justin and Jenny get tangled up with some smugglers, the twins' only escape may be the cursed Cave of the Inca Re.

Meg and Matt Browser are on a mission. Their home is on the brink of foreclosure and the twins know no other way to save their home than to go on a search for the caves of Browser Territory; the same caves Matt's grandfather told him hold treasures of the past.Navigating the unfamiliar, dark world of the cave is terrifying enough, but when the twins run into treacherous climbs and icy, bone-chilling water, the trek turns from a glorified adventure into a real life game where the stakes could be fame...or death. The twins have to push each other to the limit to escape the clutches of the cave, all in the hopes of finding the infamous Minutemen treasure and saving the only home they've ever known.

Alone in her ramshackle house, 13-year-old Yolanda Mae Crick looks in the mirror and sees a boy's face instead of her own. Yolanda follows his reflection to the ancient world of Tessar, where she learns to use her extraordinary gift, the vision to see the truth. But will she ever find the real boy behind the reflection?

Twelve-year-old Afro-American twins attempt to escape in the face of pirates, an American army, and the British forces during the Battle of New Orleans in 1815.

Many centuries ago, when the world was predominantly pagan, a legend was born—the legend of a family known as Abakr. The family was said to have originated with the birth of twin sons, at a time when it was believed by the people of the land that a twin birth was an evil omen. Parents, in their ignorance, would destroy one of the twins to protect the other. These Abakr twins, however, were so fair that the parents could not bring themselves to destroy either child. Not knowing they were the princes of Alakbar, Garren and Taron lived a normal life as circus entertainers. But that all changes on their eighteenth birthday when their mother reveals to them their true identity as they prepare to entertain the same man responsible for their father's death. Join the Twins of Kalmar on this adventure as they disguise themselves, avenge their father's death, discover new lands, and even fall in love. With a little bit of courage, the help of friends, and the belief in themselves, these seemingly circus boys face incredible odds to overcome a horrible evil that was once done to their family, and rightfully take back what their heir.

Twin girls are born in the backwoods of Kentucky in 1941. Their mother had been left alone while their father went for the doctor. On another planet a princess is born alive but dying. The two people in charge of the princess work hard to keep her alive when they realize they are not going to be able to do so. They retire to a room where they can search for a replacement and the room is set up to retrieve the infant almost immediately. Realizing they would need to protect the child from the Kings enemy Barron Zomoff they placed guards on her. They knew how desperate the man would become but figured they could handle that. But they didn't realize, that when they could only find a set of twins born about that time on Earth, that they would have the difficulties they did when they kidnapped one of them. For the twins refused to be separated either by the distance, language or education. They didn't understand that the twins would need each other for their own protection or the protection of each of their worlds or people. They didn't realize that their families would fight to get them both together. They also didn't realize, the adffect that the powerful pull on both planets would have on the children in powerful ways.

More than half of the human race is dead because of the nuclear explosions in World War Three. Pain, death, and hopelessness rule the world and crush the people left to scramble for survival. These survivors pray for an end to their suffering. Finally, their prayers are answered. Rising amid the chaos and destruction are the immortal twins, taught to survive and trained for one purpose. Three thousand years of life has taught them how to end the suffering, how to bring hope back to the world. To end the suffering, they must fight against one of their own. A tyrant who wants to rule the city with an iron fist, oppressing the people further and leaving them with no hope. The twins begin the fight alongside others like themselves so they can bring peace to the war-ravaged world. The battle they begin is one that forces them to face hardships they have never seen before in their long lives. This very battle could rip them apart at the seams. Can they restore peace to a world destroyed by its own people, or will they lose each other forever

Days before her fifteenth birthday, life is pretty good for Jessica Murphy. She expects her softball team to make it to the regional championship. She expects to catch the eye of college recruiters. What she doesn't expect is to be told she was born in another world where her twin sister and birth parents await her on the other side of a secret portal. A world away, Lexia struggles to maintain her citizens calm as invasion by a rogue king is imminent. Food supplies are low, the Council is missing, and without her sister, there is little hope for the small land of Almexia. The road to a reunion is filled with excitement, obstacles, and unexpected decisions. Raised in worlds apart, The Twins of Almexia soon discover that together they have the power to change the fate of both worlds forever.