Hide Your Eyes — Alison Gaylin

New York Rule #1: Don't get involved
Samantha Leiffer already has a self-centered self-help guru for a mother, a cadre of off-kilter Greenwich Village pals, and an ex-boyfriend who cheated on her with both sexes. She doesn't need more grief. But when she accidentally spies two people dumping a dubious-looking ice chest into the Hudson, she has an unsettling feeling about its contents...

New York Rule #2: Don't make eye contact
So, not being the kind of girl to let some psycho get away with murder, Sam sets out to unravel a mystery--and is soon being stalked by a sinister, shadowy figure who's wearing one-of-a-kind mirrored contact lenses...

New York Rule #3: If you must break Rules #1 and #2, get some help from New York's Finest...
Now, aided by a hard-as-nails (but still very hot) homicide detective, Sam is poking into some unsavory places-- and finding out more creepy stuff than she ever wanted to know...

New York Rules #4 and #5:
Don't expect anything to be what it seems...and when necessary, fight like hell.