The Time -Turner, James Turner series.  (English, Paperback, Gladwyn Halbert)

All hope lies, in the boy who allies. All is despair, at the fall of the last true heir. There has been a partition among the Turners: Infiniters, and Barrenisers are now the two faces. Another society exists in the secrecy of twilight; fierce women known as the Universals. Three secret societies are warring over a time-traveling teenage boy. Someone sinister is afoot. From the very moment James’ parents and grandfather died in a ghastly car crash, his life in Miami has been like a Euler’s disk, barely stable. The advent of a secretive family, a sicko doctor, a mysterious birth-twin, an obscure will, a rather defectively conceived lens, and an uncontrollable and confused conscience are all massing to fell down the fort of James’ wildly chaotic life. And all this starts way before James discovers THE TIME-TURNER; one of the only things his father left him. The Overlord remains in silence, lurking in the shadows, taking his time to carve out the perfect blow.