Jinxter is a text adventure computer game developed by Magnetic Scrolls and published by Rainbird in 1987.
Jinxter is set in the fictional country of Aquitania, which bears a strong resemblance to early-to-middle 20th century Britain. The central characters in the story are called "guardians" - immortal beings who look after and help other people. These "guardians" are described as liking to wear herringbone overcoats and eating cheese sandwiches.
A magical object, called the Turani bracelet, holds luck and distributes it throughout Aquitania. However, the bracelet was stolen by a witch called Jannedor Nasty, who stripped it of its five magical charms and hid them in various places. The player character is, pretty much accidentally, recruited by the guardians to retrieve the charms and fix the Turani bracelet, restoring luck to Aquitania.
Source: Wikipedia, "Jinxter," available under the CC-BY-SA License.