The Leaping (Fell House #1) by Tom Fletcher

When the sky is blood red,
when the rivers freeze
and snow lies upon the fells,
it's time for the wolves to
cross -- time for the Leaping.

Jack and Francis work in a call-centre in Manchester, where they are endlessly tormented by irate customers and sinister bosses.

When Jack's girlfriend Jennifer buys Fell House, a mysterious ruin out in the remote mountains, a move to the country seems like the answer to all their problems.

But an ancient evil is waiting in the valleys -- Fell House has another owner.

Time to lock the doors,
   Time to bar the windows,
 Time for the Leaping . . .

Genres: Horror - Thriller - Werewolves - Mystery - British Literature - Fantasy - Supernatural - British Author