ince ▁the ▁Germ ans ▁he ▁was ▁a ▁tra itor ▁willing ▁to ▁sell ▁out ▁his ▁country ▁for ▁c ash , ▁when ▁in ▁reality ▁he ▁was ▁working ▁for ▁M I 5 . ▁When ▁D icket ts ▁returned ▁to ▁England , ▁his ▁testim ony ▁resulted ▁in ▁the ▁imprison ment ▁of ▁Britain ’ s ▁first ▁double ▁agent ▁Snow ., ▁ ▁M I 5 ▁subsequently ▁sent ▁D icket ts ▁back ▁to ▁neutral ▁Lis bon ▁to ▁help ▁an ▁Ab wehr ▁officer ▁to ▁defect , ▁and ▁then ▁to ▁South ▁America ▁shortly ▁before ▁the ▁Japanese ▁inv aded ▁Pear l ▁Har bour . ▁ ▁Walter ▁D icket ts ▁married ▁four ▁times ▁and ▁maintained ▁two ▁mist ress es ▁during ▁two ▁of ▁those ▁mar ri ages . ▁W itt ▁is ▁the ▁grand d augh ter ▁of ▁his ▁first ▁mist ress ▁D ora ▁Guer rier . ▁In ▁World ▁War ▁One , ▁he ▁en list ed ▁with ▁the ▁R N AS ▁at ▁the ▁age ▁of ▁ 1 5 ▁ ▁serving ▁in ▁arm oured ▁cars ▁and ▁t anks ▁before ▁becoming ▁a ▁pilot . ▁After ▁an ▁accident ▁rendered ▁him ▁un fit ▁for ▁further ▁flying , ▁D icket ts ▁worked ▁in ▁Air ▁Int elligence ▁at ▁the ▁Air ▁Ministry . ▁D icket ts ▁served ▁several ▁prison ▁sentences ▁for ▁fra ud ▁following ▁his ▁release ▁into ▁civil ian ▁life ▁at ▁the ▁end ▁of ▁both ▁World ▁Wars . ▁ ▁W itt ▁has ▁spent ▁seven ▁years ▁research ing ▁and ▁writing ▁Walter ▁D icket ts ’ ▁bi ography , ▁called ▁Double ▁Agent ▁Cel ery : ▁M I 5 ' s ▁Cro oked ▁Hero . ▁