The early morning was disrupted for Giselle by the buzz of her phone. Twisting around, she reached out to silence it.

When she activated the screen, it lit up with a slew of missed calls—all from Megan Shaw.

But hadn’t Megan recently gone abroad? Why the sudden barrage of calls?

Concerned that Megan might be in trouble, Giselle was instantly on edge and quickly redialed.

The call connected after just one ring, and Megan's voice came through, high-pitched and ...