What does this sentence mean from "The woman in the window"?

Question

she is a Bad Cop, no doubt about it, and with disappointment I realize that Little's aw-shucks shtick must be just smoke

What does the line in bold mean - aw-shucks shtick must be just smoke.

This is from "The woman in the window".

Answer 1

I realize that Little's unsophisticated and sweet mannerisms must be just fake routine designed to confuse me

Aw Shucks : being or marked by an unsophisticated, self-conscious, or self-effacing manner an aw-shucks grin.
- https://www.merriam-webster.com/dictionary/aw-shucks

schtick 1 : a usually comic or repetitious performance or routine : bit 2 : one's special trait, interest, or activity - https://www.merriam-webster.com/dictionary/schtick

blow smoke mainly AMERICAN.
If someone blows smoke they deliberately confuse or deceive you. I just can't shake the feeling that he's up to something. Sounds to me like he's blowing smoke. - https://idioms.thefreedictionary.com/blow+smoke

smokescreen something that hides the truth about someone's intentions: Instead of doing something about the problem, the city council is hiding behind a smokescreen of bureaucracy. - https://dictionary.cambridge.org/dictionary/english/smokescreen