A wealthy woman has recruited Jesse Spenser to accompany her to her private island to attend her daughter’s wedding as a sort of stand-in husband. Spenser consents, but only after she agrees his beloved Susan Silverman will also be invited. It should be a straightforward job for Spenser: show up for appearances, have some drinks, and spend some quality time with Susan. But when Spenser’s old nemesis Rugar – the Gray Man – arrives, Spenser realises that something is amiss. With six dead bodies and questions to answer, Spenser begins a search for answers – and the Gray Man.