Wattpad: Omerta by Katarina E. Tonks

Summary:

Omertà- noun
(as practiced by the Mafia) a code of silence about criminal activity and a refusal to give evidence to authorities.

Scarlett moves into her new apartment with the mentality that she will start fresh and rule her own life. But when she overhears her mysterious neighbor murdering someone next door, her life takes a turn for the worst, and she is suddenly thrown onto the Italian Mafia’s radar.

So much for starting fresh.