Agnes and Eleanor land in Hawaii for a trip of a lifetime thanks to a lottery windfall! 
They plan a host of activities and Agnes even goes along on a snorkeling adventure, even if she’s only going to sun herself on the beach. All doesn’t go according to plans though when she finds a floater wearing scuba gear. Now they have to deal with grieving honeymooners who promptly inform Agnes that it’s their guide. 
Now the ladies are working alongside the local police, and it’s a Hawaiian adventure of oceanic proportions as they search for the killer.