主演：瑪格麗特·魯斯福德  William Mervyn  

導演：喬治·波洛克  

簡介：Marpleisextremelyproudwhensheisappointedtotheboardoftrusteesofamerchantmarinetrainingvesselwhosemissionistorehabilitateyoungcriminals.Asinallofherendeavors,MissMarpleintendstotakeanactiveroleinthejobandevenshowsuptotheboardmeetingdressedinnavalblues.Whenafellowtrusteeispoisonedjustpriortohismakingsomekindofrevelation,MissMarpledecidestouseherpositiontospendtimeontheship.Thisupsetsthevessel'sfragilesocialnetworkasshedispossessesblusteringCaptainRhumstonefromhisquarters.Whentwoship'sofficersarelaterfoundmurderedalso,MissMarpleenlistshelpfromherfriendJimStringerandInspectorCraddocktoexposethemurdererccc