After getting the main bike part from the blockade in Case 0-2 and bringing it back to the safe house, when you leave the safe house again you will hear "help help" echoing across the street.
What's that? another survivor unable to help himself you say? Of course!
This survivor is Dick, He's the owner of the local pawn shop, literally about 100yards down the block.
He wants you to clear the van he's on top of, of zombies.
Then jump up on top and talk to him, he tells you to escort him to his shop.
As I said it's not far and well he doesn't really need to be defended, so well run after him.
He has information to sell, if you don't have the money across the street you'll find a Casino, in this casino you'll find lots of slots. Break these and roll around in moneyful splendour.
Go buy the the clue and bob's your uncle? not sure how it breaks the genetic code, but enjoy :)