Free on Amazon UK
Gone Crazy by Shannon Hill
Sheriff Littlepage Eller lands a case that takes her outside her usual jurisdiction of Crazy, Virginia. Vera Collier, the formidable matriarch of the backwoods Collier clan, is dead, and no one is all that sorry to see her go. The problem: Vera’s squabbling brood of grown children, each of whom is convinced one of the others must have murdered her. Luckily for Lil, she’s got backup in the form of her feline deputy, Boris, whose lie-detector tail and oversized attitude always come in handy.
UK
http://www.amazon.co.uk/Gone-Crazy-L..._362247031_f_1
I actually bought this (and the series) after the first one was free and have throughly enjoyed the series