Freelance Ghostwriter – the word for the day is interloper.

From the Latin inter (between, among); the Dutch landloper (vagabond).

According to Webster’s: an unauthorized trading vessel in areas assigned to monopolies or chartered companies; an unauthorized trader; a person who meddles in others’ affairs; busybody; meddler.

Interloper is in the noun form.

Usage:

Sentence Usage: Avery was slightly surprised when he turned and saw Melissa standing beside him. He said, “I might have known you’d show up, but remember you’re an interloper here just the same as me.”

Sentence Usage: Janet told Marcus to keep it quiet about the party Saturday night. “The last thing we need is a bunch of underclassmen interlopers showing up and crashing our senior party.”

Thomas Hardy 1840-1928 – Visit Moments of Vision – The Interloper

From H.H. Munro (aka pen name Saki) – 1870-1916 – from the Short Story “The Interlopers”

The story is about two young men, Georg Znaeym and Ulrich von Gradwitz, whose families have fought over a parcel of forest land for generations. Even though legally the land belongs to Ulrich’s family, Georg’s conviction is strong that the land rightfully belongs to him, so he hunts there as he pleases. Eventually Georg is caught hunting in the forest by Ulrich one winter night. Neither wishes to taint the honor of their families and will not shoot at the other in cold blood without just provocation or cause, so they stand caught in each others’ gaze. An “act of God” from the snow storm causes a branch to fall, trapping both of the young men underneath. During this “captivity,” the two become friends so that the futile feud between the families may come to a peaceable end. As they call out for assistance from their men, Ulrich sees ten figures approaching. He realizes the interlopers coming over the hill are not men, but wolves.

Excerpt from the short story: “Good,” snarled Georg, “good. We fight this quarrel out to the death, you and I and our foresters, with no cursed interlopers to come between us. Death and damnation to you, Ulrich von Gradwitz.”

Excerpt from the short story: How the whole region would stare and gabble if we rode into the market-square together. No one living can remember seeing a Znaeym and a von Gradwitz talking to one another in friendship. And what peace there would be among the forester folk if we ended our feud to-night. And if we choose to make peace among our people there is none other to interfere, no interlopers from outside … You would come and keep the Sylvester night beneath my roof, and I would come and feast on some high day at your castle … I would never fire a shot on your land, save when you invited me as a guest; and you should come and shoot with me down in the marshes where the wildfowl are. In all the countryside there are none that could hinder if we willed to make peace. I never thought to have wanted to do other than hate you all my life, but I think I have changed my mind about things too, this last half-hour. And you offered me your wineflask … Ulrich von Gradwitz, I will be your friend.”