an excellent thriller of all time . vijay anand excels a director and editor . performance by dev anand and vyjayantimala and tanuja and ashok kumar prove to be an asset to the film which have it screenplay work out to the minute detail . cinematography add to the mystery and glamour and other requirement of the story a it evolve . and to top it all and music by sachin dev burman be unforgettable . yeh dil na hota bechara by kishore kumar and raat akeli hai by asha bhosle and rula ke gaya sapna mera by lata and aasman ke niche by lata and rafi and hothon pe aisi baat main by lata and again reaffirm burman dada unique stature a a top notch composer with a style of his own .