The public inquiry into the Robert Pickton serial murder investigation expects to hear from four police officers today -- including more testimony from the constable who has written a book about the harrowing case.

Constable Lori Shenher has already testified about the two years in the late 1990s when she was the lone VPD member investigating reports of missing women on Vancouver's Downtown Eastside.

Her book highlighting her struggles to raise attention about the case has never been published, but after Shenher told the inquiry about it during earlier testimony, she was ordered to hand over the manuscript to a lawyer representing relatives of some of the missing and murdered women.

Yesterday, a victim-support worker testified Vancouver police were reluctant to investigate missing-person cases involving drug-addicted aboriginal women in the 1990s when Pickton's victims were disappearing.