Fleeing Scotland in the wake of family disgrace, 16-year-old Ida Campbell secures a scholarship at a failing girls' boarding school on a remote part of the south English coast. Despite the eccentricities of her new Headmistress, who warns her of the dangers of the Cold War and the ever-present threat of the bomb, St Anne's seems like a refuge to Ida. But all this is about to change. For a start, her new room-mate is the infamous Louise Adler, potential arsonist and hardened outcast.

Meanwhile, the geography teacher Eleanor Alston, in her late thirties, a disastrous love affair in her wake, faces the new term with weary resignation. But the fragile ecosystem of the school is disrupted by the arrival of a new teacher, Matthew Langfield. Eleanor has an uneasy feeling he is not who he says he is.

And things only get worse when a mysterious sickness starts to spread throughout the school, causing strange limb jerks and seizures among the pupils. What is happening to the girls of St Anne's? Could there be a poisoner among them? Is Ida's scholarship really an escape, or is it instead a new nightmare?

The Secret History meets Derry Girls, Havoc is the perfect tragicomedy. Brimming with humour and ringing with bite, this is Rebecca Wait at her very best.