A life unraveled emerges in diary entries and interviews in the documentary "God Knows Where I Am" (10 p.m., PBS, TV-PG, check local listings).

The film's title can be stated and interpreted in two very different ways.

Put the accent on the second word and it seems an exasperated, even sarcastic, admission of disorientation and loss.

Keep the emphasis on the first and it's a declaration of certainty.

When New Hampshire police discovered a body in 2008, they first suspected their "Jane Doe" had committed suicide.

But the story that emerges here is a tale of mental illness, incarceration, isolation and alienation.

Linda Bishop, a well-educated wife and mother, began to disturb her loved ones and acquaintances in 1999 when she told people she was being hounded by the Chinese mafia.

A painful tale of burning bridges with family members, arrests, incarcerations and institutionalizations emerges in diary entries, read by actress Lori Singer ("Footloose," "Short Cuts").

Bishop eventually took to a barely heated cabin and subsisted on forest apples and water from a stream before succumbing to dehydration and starvation.

Although her mind deserted her, Bishop never lost her faith. Journal entries extol the virtues of the 23rd Psalm. Her final entries include the passage, "Jesus, take me home."

Painful beyond words, Bishop's experience is hardly rare.

Who among us has not heard similar stories about neighbors, colleagues or even loved ones?

The film is filled with interviews with Bishop's sister, daughter, friends and therapists overwhelmed by her condition.

The broadcast of "God Knows Where I Am" can also be streamed on pbs.org, beginning Oct. 16.

- A very personal glance at our justice system, the documentary "The Sentence" (8 p.m., HBO, TV-PG) also shows how unlikely people can become filmmakers, inspired by needs that have nothing to do with art or commerce.

Cindy Shank was never convicted of a crime, but received a mandatory 15-year prison sentence.

Her life was normal until a boyfriend began dealing drugs. After his murder, she got her life together, married and had three daughters.

Six years after the boyfriend's funeral, the state of Michigan used a legal technicality known as "the girlfriend problem" to charge her with conspiracy and complicity in any crimes he might have committed.

A mandatory minimum sentence put her away for a decade and a half.

Aware that his sister was being ripped away from her family, Rudy Valdez, the first-time director of "The Sentence," began to document Cindy's ordeal as well as family milestones, in order to capture them and keep his sister in touch with her loved ones.

"The Sentence" offers a glance at a family trying to cope, and a legal system employing and debating tactics once seen as cruel, draconian and unconstitutional.

Tonight's other highlights

- Blind auditions on "The Voice" (8 p.m., NBC, TV-PG).

- Oliver festers behind bars on the season premiere of "Arrow" (8 p.m., CW, TV-14).

- Athena contemplates a career move on "9-1-1" (9 p.m., Fox, TV-14).

- "Constantine: The Legend Continues" (9 p.m., CW, TV-14) discusses the DC comic book and offers glimpses at next week's season premiere of "DC's Legends of Tomorrow."

- Two survivors get the same message on "Manifest" (10 p.m., NBC, TV-14).

- Shaun sees a troubled patient as a kindred spirit on "The Good Doctor" (10 p.m., ABC, TV-14).

Series notes

A concert stampede on "The Resident" (8 p.m., Fox, TV-14) ... Dave fears friendship is a one-way street on "The Neighborhood" (8 p.m., CBS, TV-14) ... A night of trios on "Dancing With the Stars" (8 p.m., ABC, TV-PG) ... Fitness proves contagious on "Happy Together" (8:30 p.m., CBS, TV-14) ... Magnum falls under suspicion on "Magnum P.I." (9 p.m., CBS, TV-14) ... The jury is out on "Bull" (10 p.m., CBS, TV-14).

Late night

Melissa McCarthy and Phoebe Robinson are booked on "The Late Show With Stephen Colbert" (11:35 p.m., CBS) ... Jimmy Fallon welcomes Taraji P. Henson and BTS on "The Tonight Show" (11:35 p.m., NBC, r).

Mariska Hargitay, Ice-T, Sebastian Maniscalco, Tom Odell and Sean Kinney visit "Late Night With Seth Meyers" (12:35 a.m., NBC, r) ... Jon Hamm and Judy Greer appear on "The Late Late Show With James Corden" (12:35 a.m., CBS).

kevin.tvguy@gmail.com