The Diamond Caper, Peter Mayle

Mayle will forever be associated with his 1989 bestseller, A Year in Provence, but in truth he wrote many books before and has written many since. This is the third in his Caper series featuring sleuths Elena Morales and Sam Levitt. Their agenda is twofold: First, they must catch a diamond thief. Second, Elena and Sam buy a Marseille cottage and immerse themselves in an orgy of domestic indulgence.