McNally's chance - Lawrence Sanders

When Sabrina Wright, bestselling author of sumptuous tales of love lost and found, asks Archy McNally's help to find her missing husband, Archy quickly discovers it's not a simple domestic case. Sabrina's husband did not disappear: it was her daughter who ran off and Sabrina sent the girl's stepfather to find her. Both of them seem to have got lost . . .

Gillian Wright fled to Palm Beach when she heard the true story of her birth: that Sabrina had the girl out of wedlock, put her up for adoption, then adopted her.
But when local gossips get wind of the story, tongues wag and three different Palm Beach socialites come to Archy to confess their paternity and beg Archy's help to protect them from any scandal. Then Sabrina turns up dead, and Archy must take a chance - and hope to discover which of these gentlemen would kill to keep his secret a secret.