David Leese the executive at the pharmaceutical company where Stefan is working undercover is in some way connected to Rash's murder investigation. Stefan has been rumbled and surreptitiously drugged by a company rep at a party. He feels euphoric and weird and nearly gets run down by a bus until Rash saves him and who just also happen to be on the way to this party.
Stefan spends the night on Rash's sofa and both reveal a little about their jobs but not what they are investigating. Rash is also not too pleased that Stefan has taken a shine with his sister.
By the end of the episode when coincidentally they both come knocking on a suspect's house and have to give chase, they twig that they have more in common.
A polished episode, fast paced but for me it does not quiet fly. You can see these two spiky characters are going to become friends.