Showing The Grail Tree by Jonathan Gash

The Judas Pair
Every antique dealer is a bit of a detective, following clues to find the trophies that pay the rent, but when Lovejoy takes on the job of tracking down a pair of duelling pistols so rare that he's not even sure actually exist, he needs all the instincts of a detective to pick his way through an unsolved crime.

Along the way, he becomes convinced that the weapons do exist but that they have fallen into the hands of a vile murderer. Locating the ancient weapons seems like the least of his problems when Lovejoy then finds himself fighting for his life in a duel to the death!
Gold From Gemini
Lovejoy discovers how the lure of gold brings out the worst kind of treasure seeker when, broke as usual and earning a crust as an unlikely babysitter, he stumbles across the diaries of a painter that appear to point to the whereabouts of a fabled hoard of Roman gold coins.

Lovejoy is tempted to dismiss the whole thing as a hoax, but vile threats and violent intimidation have a way of changing his mind. He sets out to unravel the clues in the diaries, with some particularly nasty characters dogging his every move.
The Grail Tree
Lovejoy has heard of more nutters who have claimed to be in possession of the one, true Holy Grail than he has had hot dinners. He's not too impressed with the eccentric clergyman making the latest claim - especially when the good vicar turns out to be one of the finest forgers Lovejoy has ever met.

But when the vicar and his lady companion end up dead it becomes clear that someone else is after the old man's artefact. To solve the mystery and protect a precious piece of history, Lovejoy puts his life on the line and acquires a surprising new partner...
Spend Game
When Lovejoy witnesses a car crash that turns out to be a murder - with one of his oldest antique-dealer friends the victim - he sets out on a trail of revenge that leaves him pondering several bewildering questions.

Why did his friend buy up a load of junk furniture? What did he want with an old doctor's bag? Why was his friend killed? Who was trying to kill Lovejoy and - most perplexing of all - what the hell is he doing potholing through underground tunnels dodging armed hit men?