The Scent of Danger — Donald MacKenzie

It was a dazzling two-man jewel robbery that went like clockwork, but when Arran and his confederate, Bain, fall out the plot takes a sinister turn. Bain learns that Arran has left with the take, and without his wife, Caroline, for Gibraltar. With Caroline as bait, and a false passport, Bain follows Arran - but his single-minded desire for retribution is weakened by his attraction to Caroline, which, for the first time, threatens his criminal existence. And Bain can secure revenge only at the expense of his freedom . . .