A private jet crashes into woodland outside London. Among the passengers is a former U.S. Ambassador. Thomas investigates the apparent suicide of a successful businessman, finding unexpected connections to the plane crash.

With an explosion or engine failure ruled out of causing the crash, suspicion falls on the Deadhead - a non-flying pilot hitching a ride when his intended flight was cancelled. Then a connection is made to a sinister online forum.

When the body of a teenager is found in a field near the village where he lived the team must determine if the killer is a stranger or a local.

The team question police methods as Thomas discovers evidence challenging the time of death. Ashby seems more concerned with building the case against her main suspect. Clarissa notes a parallel with a case from the start of her career.

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With Jenny's murder unresolved, her friends at the women's refuge seek answers.

When a skeleton is found buried in cement, the team have to work out how and why he was found there. Meanwhile, Clarissa receives some devastating new about her mother.

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