Independence Day by Nia Farrell

To protect her son, boarding house owner Becca West agrees to a marriage of convenience with the town’s new sheriff.

Fearing for her life, Becca West escaped her abusive husband and has been living under an assumed name. When the new sheriff comes to town, he knows that she’s not really Molly Malone. Truly widowed, Becca vows to never again be at a man’s mercy. Sheriff Donovan insists that marrying him is her best—possibly her only—chance of keeping custody of her boy when Billy’s rich, ruthless grandfather discovers where they are. What will a mother do to protect her son?