Beautiful Malice

The UK Book Description:

So. Were you glad, deep down? Were you glad to be rid of her? Your perfect sister? Were you secretly glad when she was killed?
 
Following a horrific tragedy that leaves her once-perfect family devastated, Katherine Patterson moves to a new city, starts at a new school, and begins a new life of quiet anonymity.
 
But when Katherine meets the gregarious and beautiful Alice Parrie her plan to live a solitary life becomes difficult. Katherine is unable resist the flattering attention that Alice pays her and is so charmed by her contagious enthusiasm that the two girls soon become firm friends.
 
But being friends with Alice is complicated  and as Katherine gets to know her better she discovers that although Alice can be charming, she can also be selfish. Sometimes, even, Alice is cruel.
 
And when Katherine starts to wonder if Alice is really the kind of person she wants as a friend, she discovers something else - Alice doesnt like being cast off . . .

The US Book Description:

Is it possible to love someone too much? Is it possible to love them so much you wish them dead?

Katherine Patterson wishes she could disappear. Instead, she does the next best thing. After the death of her talented younger sister, Katherine leaves her grieving parents to the media's merciless scrutiny and moves to a new city and enrolls in a new school. Wary and alone, she seeks nothing more than anonymity. What she finds instead is the last thing she expected: a friend.

Alice Parrie is the most popular and magnetic girl in school. Extroverted, gorgeous, flirtatious, and unpredictable, she is everything that Katherine is not. Her enthusiasm is infectious, her candor sometimes unsettling, and she is impossible to resist. She takes it upon herself to involve Katherine in an entirely different life of parties and trips. She introduces Katherine to Robbie, her soulful on-again, off-again boyfriend. She becomes as close to Katherine as a sister can be, maybe even closer.

But Alice has secrets darker than anyone can imagine, and Katherine will soon discover the darkest of them all.

For Katherine Patterson, there is no escaping her past - only a descent into a trap far more sinister...and infinitely more seductive.