
Set in an idyllic English town, Beth Fairchild has prepared a surprise birthday party for her husband Tom. With most of the village present as Tom is the beloved local doctor, Beth's world is turned upside down when the party is interrupted by the police and Tom is arrested for murder. Beth believes her husband has been wrongly accused but she soon makes some shocking discoveries that cast doubt on his innocence, and she confides her worries in Adam, Tom's best friend from childhood.

Beth's party for her husband Tom is interrupted when the police arrest him for the murder of his ex-colleague. Beth secures Tom's release with an alibi but, just as the couple reconciles, she finds unsettling proof of her husband's double life.

Beth seeks proof of Tom's infidelity from his friend Adam, while police connect him to another murder. Tom admits to his affairs but denies killing Katy. Beth connects Katy to a local drug dealer, leading to a tragic confrontation with the police.

During a school event, the Fairchild's past scandalous sex life becomes public, while DI Edgeworth goes rogue to gather evidence against Tom. Beth makes a shocking discovery and plans her escape.

A year later, Beth marries Adam amidst police presence and high tension. A secret encounter with Tom prompts Beth to discover the truth behind the murders and take drastic measures in order to protect her family.
Complete episode guide for The Serial Killer's Wife with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Germany.
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