Visiting a troubled Jerusalem, schoolgirl Lillianne Pine (Lil) finds she's increasingly drawn to Harry, a young British Army Captain, after meeting a mysterious boy in white linen.

Stranger still is her sighting of a gorgeous unicorn, which passes unmolested through crowded streets as if invisible to everyone but herself and a few others.

The recently-ended Great War has flooded the city with guns, and a clash of religious festivals previously controlled by thousands of Turkish troops is now policed by just two hundred poorly trained men.

When Jerusalem erupts in riots lasting for days, ever-increasing numbers of Harry's men are amongst the casualties.

And every one of them, like Lil, had also seen the unicorn.