Gone

Impassive headmaster Michael Polly surveys a school rugby pitch as the First XV of St Bartholomew's, his team, snatches victory from the jaws of defeat - he arrives home afterwards with daughter Alana to find no sign of his wife Sarah.

Annie is struck by Michael's strangeness in the wake of an awful discovery, and a stricken Alana seeks comfort from her dad, but he is in denial as the case escalates; Michael is also frustrated by Annie and Becky's constant presence in the house.

As Michael expresses his discontent with the investigation under heated questioning, Annie alights on a new suspect who has a surprising connection to the school, and spots evidence which turns the investigation on its head.

Annie and her colleagues begin to see things in a new light as fresh information continues to emerge; two suspects hang in the balance as each accounts for their movements on the days surrounding Sarah's disappearance.

Michael is increasingly isolated as the investigation broadens and Annie doggedly pursues a new line of inquiry leading to the emergence of a compelling new suspect - sidelined in the investigation.

Alana, Annie and the rest of the police are reeling as Michael, who is numb with shock, is left to reckon with the enormity of what has happened.