It Could Be Anyone

To anyone on their flight out of New York, they appear to be five best friends excited for a destination wedding in Miami. No one would guess that each of them has a reason to want the groom dead. 
Trevor Vaughn, the groom in question, wooed his bride-to-be by first becoming close with her friends-which is to say that he learned all of the five's darkest, most dangerous secrets and blackmailed them into convincing Fiona to say "I do." The friends were forced to convince a doubting Fiona to go through with the wedding, no matter what, and now the charade is set to continue all the way to the altar.
Trevor has his own reasons for wanting to marry into Fiona's family, and he'll stop at nothing to make his plan a reality. But when he dies of an apparent allergic reaction at the wedding, surrounded by such close enemies, the possibility of murder isn't far behind. And for the authorities investigating the case, anyone present could be a suspect...
A suspenseful tale of a deadly destination wedding, It Could Be Anyone is a twisty domestic thriller that will appeal to readers of Liane Moriarty, May Cobb, and Lisa Jewell; its unforgettable characters and unpredictable plot will stay with you long after the last page.