Bestselling YA author Melinda Salisbury exposes the dark underbelly of new technologies and online friendships in this gripping thriller.

Ruby Brookes and her best friend Deva have won free places at the Ash Tree Foundation Performing Arts Camp over the summer, but only if their school grades seriously improve. So when Deva suddenly starts getting high marks in all their subjects, leaving Ruby behind, she is confused and jealous.

Until she finds out Deva's success is down to EchoStar, a new app that's helping her get...