"The codebreaker kids" . "The codebreaker kids : [ms. collection]"@en . . . . . . "Typed, handwritten corrections, photocopies, proof pages, etc. of \"The codebreaker kids.\""@en . . . . . "Three friends form a codebreaking service and meet a motley cast of characters including a Bulgarian spy, a man from the State Department, and a little old lady who wants her diary encoded." . . . . . .