When Scotland Yard is at the end of its rope, officers turn to the almighty detective Sherlock Holmes for help. When pediatric surgeons at Beijing Children's Hospital are at their wits' end, they consult "ultrasound detective" Jia Liqun for diagnosis suggestions.

But really, what does an ultrasound specialist do? Why is ultrasound diagnosis critical in treating children with critical conditions? How does an ultrasound specialist assist with operations? Follow reporter Sim Sim to spend a day with a Chinese "ultrasound detective!"