Murder on the Mississippi

Six months after the events in Death in the Ozarks, Sally Witherspoon is trying to put that terrible time behind her. She books a river cruise down the Mississippi to get away and relax.  

Unfortunately, relaxation is not to be, as she's called on to get to the bottom of a mysterious death that occurs on board. 

A combination of Cheers bartender and Miss Marple, Sally Witherspoon is as determined as ever to solve it.