Heres a tip: if your ex-husbands mistress-cum-missus asks for your help in proving that he cheated on her while he was married to you, just say no. And, whatever you do, don't invite her in . . . Coffeehouse owner Maggy Thorsen does just that when Rachel Slattery Thorsen comes knocking on her door. When the new Mrs Thorsen disappears that same evening, Maggy quickly finds herself embroiled in a murder investigation involving Rachel's hotelier family, Milwaukee's answer to the Hiltons.