| Director | John Gilling |
|---|---|
| Genre | crime film, drama film |
| Country | United Kingdom |
| Budget | $1.5 million |
Sam Carter is a jeweller's clerk who dreams of stealing a fortune in diamonds and eventually does so, but he kills a man in the process. He then embarks on the high life, but is pursued across Europe by private detective Milo March, a woman named Trudi Hall, and two thugs, Martin Lomer and Gerard Heinz. These characters end up trying to outwit each other over the largest diamond, which is worth $700,000, on a train travelling to London. March describes the diamond as "$700,000 of unhappiness" because people are willing to do anything to get it.