Desperately trying to find Childhood Novel

Any help is appreciated. I'm been having very odd memories resurface lately, one of which is a an old childhood book that I remember loving. The details are sparse; this memory has only resurfaced since today, but I'll tell you all what I remember. This has been driving me absolutely crazy over the past few hours.

It was about a boy, maybe like 13 or so, that is transported to this other realm that coexists with our own. He discovers new creatures and such, and even discovers that he has the power to slow down time, if I remember correctly. I think that he had a few friends in the realm that had powers too, but I forget what they were. At the very end of the series, the realm is overrun by this "Darkness" I think, and all the creature from the other realm are forced to go to Earth as refugees.

This is really all I remember, but again, any help is appreciated. I'm going nuts here.
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The Dark is Rising
Could it be The Dark is Rising by Susan Cooper? On the Midwinter Day that is his eleventh birthday, Will Stanton discovers a special gift -- that he is the last of the Old Ones, immortals dedicated to keeping the world from domination by the forces of evil, the Dark. At once, he is plunged into a quest for the six magical Signs that will one day aid the Old Ones in the final battle between the Dark and the Light. And for the twelve days of Christmas, while the Dark is rising, life for Will is full of wonder, terror, and delight.