Joanna and Alistair go back to Scotland under scrutiny from the media; they try to rebuild their lives, but a surprise delivery changes everything.

Joanna and Alistair become increasingly distressed, as Elizabeth's house is searched; Alistair wants to find out what the police know, as Joanna's strange behavior confuses him.

The search for baby Noah leads to the arrest of Alistair's ex-wife Alexandra, but things are not what they look like; Joanna is driven to the holiday cottage, which is now a crime scene.

Joanna is struggling with life as a new mum, and flying to Melbourne is a huge additional strain, especially when Noah cries the whole way to Australia.

After being accused of kidnapping his estranged 13-year-old daughter Jody a decade ago, Nelly goes on a search to find her after having not seen her for over 10 years.

Faith Howells is drawn into a mystery when her husband and business partner disappears.

"Apple Tree Yard" is an adaptation of Louise Doughty's best-selling novel of the same name. Written by Amanda Coe, the four-part psychological thriller stars Emily Watson in the lead role as Yvonne Carmichael, a brilliant, capable and confident geneticist. She is married with two grown children and appears to have everything -- a career, a home and a loving family. However, when she meets the charming and mysterious Mark Costley, she finds herself making choices that could cost her everything that she values.

A small-time solicitor is asked by strange lawyer to find a missing witness who is vital to her client's alibi; when he takes the job he is inadvertently drawn into investigating the death of his brother 20 years earlier.

An obsessed man unable to accept the abduction of his young son spends years searching for him.