Showing The Summoning by Kelley Armstrong

All Chloe Saunders wants is a life like any normal teenager - the chance to get through school, make friends, and maybe meet a boy. But when she starts seeing ghosts, she knows that life will never be normal again.

Soon ghosts are everywhere, demanding her attention. When Chloe finally breaks down, she's admitted to a group home for disturbed kids. At first Lyle House seems okay, but as she gets to know the other patients - charming Simon and his ominous, unsmiling brother Derek; obnoxious Tori; and Rae, who has a 'thing' for fire - Chloe begins to realise that something strange and sinister binds them all together, and it isn't your usual 'problem kid' behaviour.

And they're about to discover that Lyle House is not your usual group home, either . . .