A man called McGeely arrives in Scotland but cannot leave his ship because he has no papers. He claims he comes from Glasgow and mentions Sauchiehall Street as proof. But as the Customs men point out, everyone all over the world has heard of Sauchiehall Street. Smith and McInnes are after some smugglers who are bringing high quality jewellery into the country in small quantities. McGeely is given a piece to smuggle ashore but when he vanishes from the ship the smugglers have about as much idea as the Revenue men about where to find him. Who gets there first?

The I.B. are confronted by a case of 'the worst kind of smuggling'. Campbell puts Ross McInnes on the trail of the client concerned. Ross traces him as far as the Inner Hebrides but arrives too late. It seems he cannot pursue the case any further - it's a dead end. He returns to report his failure to a furious Campbell.

Last week Logan's death brought Ross to a halt. This week Smith resumes the search for the man who supplies the peddlers.

Johnny Cain is back again and Smith's holiday in Switzerland develops into another case for the I.B.

A labourer is taken to hospital having been poisoned by a bottle of illegal whisky. Ross McInnes investigates.

Smith is faced with a very difficult moral problem when he is informed that there are several illegal immigrants working at the docks.

The I.B. are called in to assist when the Waterguard are being annoyed by the activities of Miss Stella Bruce, a rich young playgirl.

A huge combine is selling smuggled goods in working-mens' clubs, but there seems to be no way for the police or the I.B. to break the organisation.

Pressure on a colleague leads the I.B. to examine the sport of kings.

A family reunion sets Smith off on the trail of an illicit brew.

""Pull up the ladder, Jack"" could well be the Big Feller's family motto.

A dangerous man escapes from jail and Smith becomes involved.