You've Got Blackmail — Rachel Wright

Lozzie Cracknell is a girl on the edge. Her parents have recently separated; she forgot to mail the invitations to her mum's super-important client party; the school bully is out to get her following an unfortunate e-mail incident involving Photoshop and a picture of a horse's behind; and now it looks like Mum might be dating her English teacher, the utterly loathsome Mr. Hilary Barnett.

Just when she's got about as much stress as she can handle, Lozzie and her best mate Dex stumble upon a tantalizing mystery-it seems Mr. Barnett is being blackmailed. But who on earth would blackmail a bore like him, and why? As they delve deeper into the mystery, questions pile on top of questions, and the one thing that does become clear is that danger can lurk in totally unexpected places . . .

Packed with irresistibly quirky characters, startling twists, and laugh-out-loud humor, this breathlessly paced comic mystery is all but impossible to put down.