Whistle and I'll Come (2014)

Dr. Tyler Freeborn at Miskatonic University has acquired a strangely carved whistle taken from Stone Age tribes in the New Guinea jungle. He has persuaded Dr. Armitage and the Derby Foundation to fund a small expedition to find the source of the whistle. They will journey to New Britain, Papua New Guinea, provision and hire guides, then venture into the unmapped rainforest to find the tribe who carved the whistle.