When Marlowe comes to, he finds that he has been tied up and handcuffed. A woman is sitting beside him and we learn that she is Eddie Mars' wife, Mona Grant. She has striking platinum-colored hair and it's pretty clear Marlowe thinks she's a looker.
When Marlowe remarks on her hair, Mona pulls it off saying it's a wig: she had cut off her hair to prove to Eddie that she was willing to hide out and not cause trouble. Marlowe starts calling her Silver-Wig. Some nickname.
Marlowe accuses Mars of being involved in a murder, but Silver-Wig defends Mars because she's still in love with him. She also assures Marlowe that her husband didn't kill Regan.
She frees Marlowe from the ropes, but doesn't have the key to unlock the handcuffs.
Fearing for her safety, Marlowe asks Mona to come with him, but she turns him down.
Before he leaves, Marlowe plants one on her (settle down, buddy), but her lips are as cold as ice.