He's probably protecting his next kidney in case this one fails.
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It seems it is Cain's turn to be made stupid. If he wanted to find Nate surely the thing to do was to follow the van to find Nate's new address?
"Hello, I'm a random stranger here to pack up Nates things".
"Yes go right ahead, I'll just wait downstairs fuming while you help yourself to whatever you fancy."
Do the writers give the viewers any credit at all?
did tracy not wonder why nate took nothing to shetland, where is his car?