▁World ▁War ▁II ▁( 1 9 5 7 ) ▁- ▁originally ▁published ▁as ▁Ev idence ▁in ▁Camera ▁in ▁the ▁UK ▁ ▁Be es ly , ▁Patrick . ▁Very ▁Special ▁Int elligence : ▁the ▁Story ▁of ▁the ▁Admir alty ' s ▁Oper ational ▁Int elligence ▁Centre , ▁ 1 9 3 9 – 1 9 4 5 ▁( 1 9 7 7 ) ▁ ▁H ins ley , ▁F . ▁H . ▁British ▁Int elligence ▁in ▁the ▁Second ▁World ▁War ▁( 1 9 9 6 ) ▁( ab rid ged ▁version ▁of ▁mult iv ol ume ▁official ▁history ) ▁ ▁Jones , ▁R . ▁V . ▁Most ▁Secret ▁War : ▁British ▁Scient ific ▁Int elligence ▁ 1 9 3 9 – 1 9 4 5 ▁( 2 0 0 9 ) ▁ ▁K ahn , ▁David . ▁ ▁Hitler ' s ▁Sp ies : ▁German ▁Military ▁Int elligence ▁in ▁World ▁War ▁II ▁( 1 9 7 8 ) ▁ ▁K ahn , ▁David . ▁ ▁Se izing ▁the ▁En igma : ▁the ▁Race ▁to ▁Break ▁the ▁German ▁U - Bo at ▁C odes , ▁ 1 9 3 9 – 1 9 4 3 ▁( 1 9 9 1 ) ▁ ▁Kit son , ▁Simon . ▁ ▁The ▁H unt ▁for ▁Naz i ▁Sp ies : ▁Fight ing ▁Esp ion age ▁in ▁V ich y ▁France , ▁Chicago : ▁ ▁University ▁of ▁Chicago ▁Press , ▁( 2 0 0 8 ). ▁▁ ▁Lew in , ▁Ron ald . ▁The ▁American ▁Magic : ▁C odes