Night Train for Inverness

7-year old Ted has diabetes. When he leaves the hospital, the doctor tells his mother Ann not to forget the insulin injections twice a day, which for Ted is a matter of life and death. At the same time as Ted leaves hospital, his father Roy leaves prison. During his six months in jail Roy has written a letter every week to his wife, but his mother-in-law has torn them up, to prevent her daughter from reading them. She has also convinced Ann to divorce. Roy rents a room in London, and then goes to Ann`s house to visit her and their son. The mother-in-law tells him to stay away, because Ann and Ted don`t want to see him anymore. In his despair Roy involves an old sweetheart in a plan to kidnap Ted. If she accompany them on the night train to Inverness, they will be perceived as a family, and thereby not evoke any suspicions. He doesn`t know that Ted has diabetes and needs his injections. The police soon find out that Roy has kidnapped Ted, but they don`t know where they have gone.