A Vietnam War veteran and friend of Allen and Burt. He joins the cruise but is later gruesomely killed during the attacks.
Allen and Mark are connected through friendship and wartime experience.
Mark is described as a Vietnam War veteran and a friend of Allen.
Burt and Mark share a wartime friendship and a troubling past.
The plot explicitly identifies Burt and Mark as Vietnam War veterans and friends.
Mark and Isabel are married passengers whose relationship is disrupted by the killings.
The plot introduces Mark and his wife, Isabel, as a couple joining the cruise.
Linda and Mark are members of the same passenger group.
Linda meets Mark when the couples gather on the yacht before setting sail.
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