Gold from Gemini (Lovejoy Series #2)

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.