In a quiet Surrey village sits Leventree, an architectural practice set up by idealistic couple Florence and Arthur Mayhood, offering apprenticeships to young offenders after their release. Motivated by his own memories of Borstal, Arthur aims to mentor young adults with a troubled upbringing and give them opportunities to succeed. Their first prot?g?es are siblings, Joyce and Charlie Savigear, who quickly settle in; but when a dangerous figure from Joyce’s past comes knocking, the Mayhoods’ earnest hopes of doing good turn tragic. Forced into betrayal, Joyce must make a decision that will change her brother’s life and threaten everything the Mayhoods have been trying to build.