3 stars out of 5 -- The spare, slow-burning film is the antithesis of the 007 franchise's excesses, and all the more enjoyable for it.

Rating: 3/5 -- Embora inferior a Funeral em Berlim, que contaria com um roteiro melhor, o primeiro filme da série ainda funciona graças à direção de Furie, à atuação irônica de Caine e à forma curiosamente monótona com que o cotidiano da espionagem é retratado.

Deighton's plot is a mild headache of deceit and double-dealing that glides stylishly and with much wit around Caine's Sergeant Palmer, a cocky London bachelor and middle-ranking scion of the MoD's counter-espionage department. Full Review

Rating: 5/5 -- Michael Caine is the epitome of Sixties cool in his first outing as the secret agent Harry Palmer. Full Review

[T]here's still a sense of swinging London glamour in Caine's iconic, horn-rimmed-glasses-wearing performance.

Ipcress proves again that one of the primal pleasures of moviegoing is a tingling, no-nonsense suspense yarn enlivened by honest good humor. Full Review

It does smack a little of Bond-style technical gimmickry. But the spectacular violence and playboy-style sex of the Bond series has been avoided without any loss of entertainment value. Full Review