Two steps below them stood the mysterious assassin.

Tailler had sent his master the news about the mysterious de Montfort assassin.

"There are two courses open to our mysterious assassin," said Poirot slowly.

Looming in the background is a mysterious assassin called the Copperhead.

Each person he questions in the search for the ring is murdered by Hulohot, a mysterious assassin.

The man believed that he was about to die at the hands of a mysterious assassin.

To date, the mysterious assassin was a suspect in at least twenty unsolved murders.

However, before they can attend the funeral, the trio is attacked by mysterious assassins.

Could the G'kkau be involved in this theft, he speculated, or the mysterious assassin?

Luke manages to get hold of the mysterious assassin, but he then suddenly vanishes.