[2] Directed by Ted Tetzlaff, it was produced by MGM at the company's Elstree Studios with sets designed by the art director Alfred Junge.

[3] In Birmingham, England, one evening, Constable Baron confronts a suspected local vagrant and asks him what he is doing in a fenced-off railyard.

A computer search of all records determines that the nearest man capable of defusing any bomb or booby trap set to trigger the entire lot of scores of one-ton mines is a former Second World War bomb disposal specialist living in Birmingham, Major Peter Lyncort, late of the Royal Canadian Engineers.

Acting on Constable Baron's belief that the perpetrator will go to Portsmouth to witness the detonation of his handiwork, the patched-up officer is dispatched there to round him up on sight.

After stopping at a local hospital for an electric stethoscope and some necessary tools, Lyncort is whisked to the railspur, and begins laboriously examining and opening the sea mines one by one.

Warrilow and a Constable maintain a watchful but safely distant vigil over Lyncort, attentive to any sign of alarm or danger from him.

Upon discovering she had missed the 10:30 train, the midnight run has been canceled, and the next out is in the morning, Janine had repaired to the railway canteen to wait out the night.

Harassed by an old dodger she leaves to grab a cab, only to learn not a one is to be had, all having been requisitioned to aid in the evacuation of the little town threatened by the bomb.

Unaware that Lyncort has found a charge and disabled it, the truculent sabateur refuses to divulge any information about the sabotage and who may have put him up to it.