Episode 1 - The News from Warrendale (12:41)
Mary and her father Matt visit Mary's mother Jill in the hospital on the eve of a new experimental treatment that will require Jill to go into isolation for several days -- or even weeks.
Episode 2 - A Call from Chicago (11:22)
Why has Mary's troubled sister Julia escaped from Warrendale -- and who is Arthur Mendez?
Episode 3 - Advice from Professor Banks (12:17)
Mary visits her beloved professor to ask advice about her future. But is Mary's troubled twin sister Julia far behind?
Episode 4 - Mary Takes the Train (13:05)
Who's that lurking in the yard? And when Mary takes the train to Chicago, what mysterious stranger does she encounter?
Episode 5 - Interview with Arthur Mendez (14:08)
How will Mary react to the despicable David Price? And what's happening back home while she's away?
Episode 6 - A Bad Night for Scott Dascombe (11:14)
Why have the police gathered around Mary's house? And who did Mary's father see hiding in the dark?
Episode 8 - Two Calls to Warrendale (11:46)
What secret is Mary's troubled twin sister hiding? The mystery widens.
Episode 7 - Dr. Farrhi's Mysterious Visitor (13:14)
Dr. Farrhi shares her surprising news.
Episode 9 - Mrs. Marshall Awakens (12:12)
What terrible secret did Julia share? And why did she nearly kill her nurse to keep it hidden?
Episode 10 - Arthur Mendez Wants a Favor (13:22)
What plan is Arthur Mendez hatching, and what role does Mary play in it?
Episode 11 - Mary Asks for Help (14:21)
Mary investigates her sister's mysterious escape from Warrendale.
Episode 12 - The Airless Room (13:20)
Mary and John seek out the mysterious tapestry -- but at what risk?
Episode 13 - The Mummy's Toe (10:30)
John and Mary are trapped in the airless chamber... how will they escape?
Episode 14 - The Gouverny Pattern (12:40)
What is the Gouverny Pattern, and what did Julia want at the museum? Mary and her friends seek answers.
Episode 15 - The Garden Hall (12:15)
Mary and her friends arrive at Warrendale, seeking answers.
Episode 16 - Bedroom in the Sky (13:49)
What is Dr. Robert Blank hiding? And why has Nurse Fontaine disappeared?
Episode 17 - Mystery on Jarvis Road (11:22)
Mary and her friends track down Ella Fontaine – and make a shocking discovery.
Episode 18 - The Painted Sky (10:35)
What's painted on Ella's ceiling -- and who's that coming up the road?
Episode 19 - The Burning World (7:19)
How far will Gillian Fox go to destroy the evidence in Ella's trailer?
Episode 20 - Return to Warrendale (10:42)
Mary locates Dr. Robert Blank and uncovers a crucial clue.
Episode 21 - The Storage Unit (11:23)
A tragic discovery in Ella's storage unit produces a new lead.
Episode 22 - Danger in Indian Village (12:21)
A journey to Detroit's Indian Village reveals startling information.
Episode 23 - A Story Hinted At (8:39)
Mr. Barker unspools a strange history of intrigue.
Episode 24 - The Barefoot Legionnaire (8:54)
Events at Mr. Barker's house take a decisive turn.
Episode 25 - The Thing in the Garden (11:18)
Chapter One concludes. New episodes coming this fall!
Episode 26 - Life Goes On (12:16)
Mary returns. Someone has died, the mystery persists, and Mary is in danger. Who will she turn to?
Episode 27 - The Girl on the Roof (10:07)
Mary enlists Angela’s help at Mr. Barker’s house. John has terrible news.
Episode 28 - Who is Francine? (10:44)
Scott is missing, and Angela thinks she knows what the strange mannequin is.
Episode 29 - The Voice of the Dead (12:46)
A new discovery means Mary and her friends must return to the deadly nitrogen chamber.
Episode 30 - The Message on the Skull (14:41)
A shocking discovery sheds new light on Francine. Mary and her friends confront David Price.