Midnight Clear by Mary Kay Andrews

Ex-Atlanta cop-turned-house-cleaning entrepreneur Callahan Garrity doesn't know what she is getting for Christmas, but she never expects the gift that arrives at her door: her estranged, ne'er-do-well brother, Brian, and his adorable three-year-old daughter, Maura. A rebel who's been in and out of trouble most of his life, Brian's deep in it now since he illegally abducted Maura from under the nose of his shrewish former wife.

When the beautiful child's mother is found murdered, the police come looking for Brian. And now, to save her brother and her holiday, Callahan -- along with her irascible mom, Edna, and a gaggle of House Mouse employees -- must uncover the truth and a killer, even if it means digging around the roots of her own family tree and exposing the rot underneath.