They saved the best episode for last and what an episode it was! Santamaria Yusuke's Akamatsu is a great villain because he is evil and he knows it and there is no 'what would know about how I feel?' and he doesn't go crazy with stupid overacted laugh like 99% of jdorama and anime villains.
The most interesting thing about this episode is how the main character/victim of this episode is Yoshida Yo's Ishikawa and how it exposes hers and Akamatsu's innermost demons. They are both characters with horrible childhood and both of them deal with the emotional scars in different ways.
On the whole I rather enjoyed Cold Case and its a lot better than the clumsy Ishi no Mayu. Its got a few must watch episodes but just doesn't cross the line into must watch for me. Very watchable and I hope to see more no nonsense police jdoramas like this in the future.