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Marpleisextremelyproudwhensheisappointedtotheboardoftrusteesofamerchantmarinetrainingvesselwhosemissionistorehabilitateyoungcriminals.Asinallofherendeavors,MissMarpleintendstotakeanactiveroleinthejobandevenshowsuptotheboardmeetingdressedinnavalblues.Whenafellowtrusteeispoisonedjustpriortohismakingsomekindofrevelation,MissMarpledecidestouseherpositiontospendtimeontheship.Thisupsetsthevessel'sfragilesocialnetworkasshedispossessesblusteringCaptainRhumstonefromhisquarters.Whentwoship'sofficersarelaterfoundmurderedalso,MissMarpleenlistshelpfromherfriendJimStringerandInspectorCraddocktoexposethemurderer.