Deathbed promise, stolen treasure, Vegas casino, desert road trip, unmarked graves, and the journey of a lifetime, as four poker buddies uncover clues leading to more than one type of treasure. A forensic psychologist working for the FBI moves to Shipwreck Island and renews her relationship with her sisters, aunt, best friend, and old flame.

In book 10 in the series, Sydney is busily packing for a romantic getaway with her boyfriend, Doctor Logan Alexander, when Colin Black, her boss at the FBI, calls to ask her for a time sensitive favor. It seems that Enzo Masterson, aka The Joker, has died, and upon his death he has bequeathed to his four poker buddies from the Sunny Meadows Senior Living Home clues that, Colin believes, will lead them to stolen treasure worth tens of millions of dollars. Colin had unsuccessfully been chasing The Joker his entire career, after inheriting the unsolved thefts from his father, who was an agent for the FBI in the sixties and seventies when the thefts occurred.

Colin's father has passed on now, but Colin is determined to find the seemingly impossible to find treasure on his father's behalf. His belief that Enzon Masterson left his buddies the very treasure Colin has been after, prompted Colin to call in one of the many favors Syd owes him. After a bit of back and forth, Syd agrees to Colin's plan to switch her and Logan out for the motor coach drivers the poker buddies hired to take them on their adventure. Syd's mission is simply to go along and observe. She is to listen to conversations, gather clues, help the men with their quest, and stay in constant contact with Colin during the long road trip through the Pacific Southwest.

When the first clue takes the group to a destination that reveals something unexpected, Syd realizes that the journey she and Logan have embarked on might just be about more than one type of treasure.