A judge will investigate claims by a secretary - said to have made a clandestine phone call for help from an unknown location - that she is being held by graft-busters against her will.
Mr Justice Michael Hartmann, of the Court of First Instance, will hear evidence today from the Independent Commission Against Corruption on whether Becky Wong Pui-sze is in their custody and the legal basis for keeping her.
Ms Wong, a secretary for Derek Wong Chong-kwong, chairman of listed company Semtech International Holdings, was arrested with her boss and seven other people last Friday over alleged payments of more than $1.5 million to bankers and analysts to manipulate Semtech's share price.
The commission has said the nine have since been released on bail.
But a writ of habeas corpus was filed on Wednesday alleging Ms Wong was being held against her will.
A hearing will be heard today after the writ was upheld in the face of an ICAC appeal yesterday.