Rift Runners Series by Jennifer Fallon

The Undivided are divided. The psychic twins, Ronan and Darragh, have been separated by the traitor Druid, Amergin, who has kidnapped Ronan and thrown him through a rift into another reality. Now time is running out for Darragh. If Ronan isn't found soon, they will both die. But his twin brother is lost in a reality where Druids are legend, and there is no magic. Somehow, before the Autumn Equinox, they must find one young man in a world of six billion people.. moreThe Undivided are divided. The psychic twins, Ronan and Darragh, have been separated by the traitor Druid, Amergin, who has kidnapped Ronan and thrown him through a rift into another reality. Now time is running out for Darragh. If Ronan isn't found soon, they will both die. But his twin brother is lost in a reality where Druids are legend, and there is no magic. Somehow, before the Autumn Equinox, they must find one young man in a world of six billion people...Meanwhile, Ren Kavanagh has no notion of where he comes from. He is plagued by strange injuries that appear from nowhere and everyone is convinced he is deliberately harming himself for attention. Then he meets the enticing and mysterious Trasa, and before he can figure out how it happened, he is in serious trouble - arrested for arson and possibly murder.Rescue will come from a completely unexpected direction. Ren is about to discover more about his origins than he bargained for, meet the twin brother he never knew he had, and discover nobody is what they seem, especially his new friend, the half-faerie, half-human Trasa... Amergin's daughter. less

Time is running out for Rónán and his psychically-linked twin brother, Darragh.In two weeks, at the Autumn Solstice in their own reality, the Queen of the Faerie will transfer the Undivided power to the new-found heirs and the older twins will die. But Darragh is trapped in 2001 Dublin and Rónán in a reality where the Undivided are not Druids, but Shinto warriors... moreTime is running out for Rónán and his psychically-linked twin brother, Darragh.In two weeks, at the Autumn Solstice in their own reality, the Queen of the Faerie will transfer the Undivided power to the new-found heirs and the older twins will die. But Darragh is trapped in 2001 Dublin and Rónán in a reality where the Undivided are not Druids, but Shinto warriors.The twins need to get home before the transfer takes place - not only to save their own lives, but to break the curse on Trása, who is destined to remain trapped by Marcroy Tarth's spell, and to rescue Hayley from the Faerie Lord's seductive embrace.With Darragh caught in a reality without magic, and Rónán stranded in one with plenty of magic but no idea how to use it, the brothers must prove that even across realities, they truly are the Undivided. less

Ren of the Undivided and his half-Faerie companion Trása must find a way to stop the Matrachai, who want to eliminate every magical race in existence. Only the Undivided hold the key to stopping them, and even the Faerie Brethren have turned to Ren for assistance. With the help of the Pete and Logan Doherty, the human twins stranded with them, Ren must find a way to save them all, especially his twin brother Darragh... moreRen of the Undivided and his half-Faerie companion Trása must find a way to stop the Matrachai, who want to eliminate every magical race in existence. Only the Undivided hold the key to stopping them, and even the Faerie Brethren have turned to Ren for assistance. With the help of the Pete and Logan Doherty, the human twins stranded with them, Ren must find a way to save them all, especially his twin brother Darragh. REUNION is the third book in the fabulous Rift Runners epic fantasy series, following on from THE UNDIVIDED and THE DARK DIVIDE, and switches through time portals between the contemporary world and a Celtic Druidic Britain. less