Horsewoman chronicles the tribulations a woman goes through to regain her ex-lover's trust and, ultimately, her love after a series of ten-year-old lies. Along the way, the woman discovers that her former father-in-law lied about several things. Her ex-lover is not a drunk nor is she addicted to sleeping pills. Her ex-lover's son is the result of artificial insemination and not sex with a husband she never had. While she didn't have a husband, she had a domestic partnership with another cop who died in the line of duty. The biggest surprise of all is how the woman comes to love the child she and her ex-lover had planned to have together.