Sin of Omission by Charmaine Gordon

Seems easy enough. Jimmy Costigan will deliver supplies to sister Charlie's project Haven,a respite for the needy, and leave.Simple. 

Instead Shelley Jackson answers the door,says she needs him and soft-hearted Jimmy stays to protect the family seeking refuge from a sociopath. He didn't count on falling in love.

A twist of fate intervenes when Shelley keeps a secret that threatens to break apart the Costigans and her future. A mysterious client, Deanna Rose, enters Haven, victim of a savage beating under strange circumstances. Using Internet resources, Shelley digs in to find Ms. Rose has an unsavory past. With the reputation and safety of Haven at stake, Shelley is at risk to lose everything and everyone she cares about.