Melancholy baby - Robert B. Parker

Boston PI Sunny Randall now faces the unthinkable: the marriage of her ex-husband, Richie, to someone else. Despite the finality of divorce, Sunny and Richie's relationship had continued, in its own headstrong way, until Richie's desire for marriage overtook Sunny's need for freedom. So when college student Sarah Markham comes asking for help in finding her birth parents, Sunny realises she must take the case, if only to distract her from her personal life. But life and work have a curious - and dangerous - way of intersecting.