If ya mean after ya stop thief V then what ya do is help people like martin, dj candy, and others like that.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~After you've stopped thief V from stealing the secret...
I would choose the wii version. In my opinion, the wii versions for MySims games are a lot better than DS versions. I have MySims Agents Wii and it is awesome! I don't have MySims Agents for DS, but...
if you are looking for the stone that findsthe secret map it is in the little garden thingy near Martin's house. Find it. Then after you do THAT, there will have 2 martins appear, one is thief v....