Exodus - The Old Farts Club, #1

Jamaica: a Caribbean paradise fraught with unseen danger. The Old Farts Club: a small group of mixed-age military veterans with various 'skills' who frequent a local fast food joint to swap stories and trade tales. During a dream Jamaican vacation, Danny 'Dud' Wilkerson is devastated when, after a seemingly random accident, his wife Evie vanishes. The Montego Bay police force insists on a seventy-two hour wait before anyone is officially considered missing.
With concrete evidence of her disappearance, Dud can't wait and, faced with a race against time to find his wife, calls on The Old Farts Club to join him in paradise to track her down. Little do they know, Evie's disappearance is just the beginning of a scary and thrilling adventure that takes them from paradise to Hell, as The Old Farts piece together clue after clue and use all of their skills to not only find the missing woman, but to stop something altogether more sinister.
Exodus - the first book in The Old Farts Club series.