Before he could expose a big financial swindle, Clarence Fortinbras was interrupted. He always said that office life would kill him. Exit Fortinbras. Enter John Putnam Thatcher.

Clarence Fortinbras is a revered name in the world of accounting; retired professor and author of the standard university textbook on accounts receivable, he is a man passionately in love with his chosen discipline. National Calculating Company is a struggling business-machine firm that has suffered several years in a row of falling profits and dividends.

Self-appointed leader of a rogue stockholder’s group, Fortinbras is on a crusade to get to the bottom of any jiggery-pokery and obtains a court order allowing him to conduct a thorough audit of the company books. When he is found strangled with the cord to his own adding machine, National Calculating is plunged into a stock crisis and Sloan Guaranty Trust sends in senior banker John Putnam Thatcher in an attempt to stop a financial hemorrhage. What did Fortinbras find, and which company officer do those findings implicate? The list of suspects includes NCC's ineffectual and ulcer-riddled president, his ambitious nephew, the rival leaders of NCC's two business units, and the coolly cerebral female scientist who has a great deal more clout in the firm than her job title would suggest.

The third of Emma Lathen’s witty mysteries featuring elegant, urbane John Putnam Thatcher, senior vice president and head of the trust department at Sloan (third largest bank in the world) and a formidable ferreter-out of financial - and other - secrets. Written in 1964, it reflects a time and an industry on the brink of the computer revolution.