The governor of Gaul has always been a "creative" accountant. Now he's under investigation by Vexatius Sinusitis--or he was, until someone poisoned the investigator. In order to heal Vexatius, Asterix and Obelix set off to locate a special flower that grows only in Helvetia.

Gaul was divided into three parts. No, four parts - for one small village of indomitable Gauls still held out against the Roman invaders. Quaestor Vexatius Sinusitus turns up in Gaul to investigate the creative accountancy of Governor Varius Flavus. When the quaestor is poisoned, he turns to Getafix the druid and the other Gauls for help.