The White Darkness by Geraldine McCaughrean
Well! This book really suprised me. I think I was expecting a female version of Peak, only with an Antarctic setting and I wasn't terribly interested. It sat on my shelf for a while, until it was the last T.U. book I had in the house. Should have known that McCaughrean wouldn't give us typical adventure fare!
Symone is spirited away to Antarctica with her "uncle", presumably as a spur of the moment decision. But as Sym watches, the deceptions and lies unfold around her. Eventually she is left, abandoned on the Ice, with a con man/actor and her imaginary beau Titus. A harrowing, thought-provoking adventurethat is just creepy enough!