Galvin discovers that something bizarre is happening with the patients that are being brought into the hospital. Maggie gets a clue about how to keep The Source from taking over….

When Niko reaches out to Mel for help, she unknowingly reveals a new demon. Maggie volunteers to infiltrate the “cult” to help thwart him, but when she goes missing Macy…

When Harry mysteriously disappears, a substitute Whitelighter, Tessa, surprises the sisters. With Galvin’s return imminent, Macy knows she must tell him her decision about her demon side. Niko is curious…