Childhood best friends Holly McStay and Georgia Cunningham are at university together, where they meet The Clique, helmed by enigmatic Professor Jude McDermid, and everything changes.

After shocking events, Holly becomes increasingly wary that something is wrong at Solasta Finance and with the Clique. Meanwhile, Georgia grows more distant and everyone's pretending that there's a perfectly reasonable explanation for everything that has happened.

Holly is ready to start her new life as part of Jude's Clique. But Georgia continues to push for a competitive position at Solasta, Holly remains suspicious — a feeling that intensifies when she starts to receive warnings from a mysterious stranger. As the pressures mount on Georgia, Jude and her girls pull tight, clinging to their old loyalties and turning a blind eye to the extraordinary circumstances around them. On an evening out, things come to a head and both new and old friendships find themselves tested to breaking point.

Holly is finally getting comfortable; her relationship with Rory has stepped up and her friendship with the girls feels ever more real. But an awful truth surfaces, shattering all that Holly's succeeded.

With undeniable proof right in front of her, Holly can now no longer deny the darkness of the world that she and Georgia have entered. Reaching out to Rory, she's shocked when he counsels patience in the face of such startling evidence.

Holly has been taken right to the edge, and now she's doubting every choice she's made — who she's trusted to how she's acted. The stakes are sky high and there's nowhere left to turn.