Twists, Turns and 100% Tilda — Karen McCombie

Tilda is Portbay's resident gloomy goth - and Stella can't decide whether she should be fascinated by her stripy tights and tutu comboo, or freaked out by her unfriendliness. But Tilda is not the only strangeness afoot in not-so-sleepy Portbay. There's the cryptic notes which keep appearing, for one thin and the mystery of Joseph's House for another. Not forgetting the beach party that goes wrong in a rather peculiar way...The sixth book in a bestselling series.