Tell a cypher book nothings gone mad and see the real enigma of Alan Turing (9,4)
explanation :
Tell a cypher b(oo)k (nothings gone) (mad = anagram indicator) = Bletchley Park.
see the real enigma of Alan Turing .
(this is where he will see the actual enigma machine Alan Turing worked on while leading a team of scientists at Bletchley Park during WW2).
Ps. Hope he has a wonderful day.