TessandLoganarebacksolvingmysteriesasanoldfriendofTess’sisfounddeadjustbeforehewasgoingtoproposetohisgirlfriend.Codes,cyphers,andcrosswordpuzzlesalllendahandatfindingthekillerasTessandLogantrytofindawaytoworktogethertodeciphertheclues.