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ProfessorAliceRobertsexplorestheUK’spast,focusingonsixkeyerasbyexploringthestoriesoftownswhichbestillustrateeach.
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TessandLoganarebacksolvingmysteriesasanoldfriendofTess’sisfounddeadjustbeforehewasgoingtoproposetohisgirlfriend.Codes,cyphers,andcrosswordpuzzlesalllendahandatfindingthekillerasTessandLogantrytofindawaytoworktogethertodeciphertheclues.