Aquarius

It's 1967 and the era of free love, drug experimentation and Vietnam is in full effect.
When Emma (Emma Dumont, "Salvation"), the teenage daughter of a respected lawyer, goes missing, LAPD detective Sam Hodiak (David Duchovny, "Californication," "The X-Files") starts asking around. He soon discovers that the hippie kids he's questioning don't take kindly to cops, especially a cop with hair as short as his.
Needing the help of someone he can trust, he partners with a young undercover cop named Brian Shafe (Grey Damon, "Percy Jackson: Sea of Monsters," "Friday Night Lights"), a law-abiding officer who struggles with his own demons. Hodiak also begins to rely on Charmain Tully (Claire Holt, "Vampire Diaries," "Pretty Little Liars"), an ambitious rookie cop who's anxious to prove herself in a male-dominated profession.
It's not long before they stumble upon a small-time cult leader seeking out vulnerable women to join his cause. From there, they follow this man's trail down a rabbit hole of drugs, sex, murder and cultural revolution. Little could they know, however, the guy they're hunting will eventually become the killer we now recognize as Charles Manson (Gethin Anthony, "Game of Thrones") - a lost soul who desperately wanted to get into the music scene of the '60s until something snapped.