If you remember both in Murder My Sweet and Farewell My Lovely both Philip Marlowe and Moose Malloy are ambushed and as the Marlowe character is ducking for cover behind parked cars, Malloy just goes out and after the ambushers. In both films Marlowe remarks "fear just wasn't built into his makeup."
That's about what Goren and Eames are dealing with in solving the murder of a young graduate math student Olivia Swan. She's part of a group of kids who are developing sophisticated gambling systems in order to win big money. The group is headed by Ian Kahn and like Moose Malloy fear just isn't part of him.
Which makes him a particularly dangerous foe and someone it will be a real challenge to break down and confess. Kahn performs one particularly brazen act and gets away with it, but it also lets Vincent D'Onofrio and Kathryn Erbe know exactly what they're dealing with.
Kahn is mesmerizing character and it's worth watching to see Goren and Eames go up against one of their most dangerous opponents.