The Mystery of Lake Lethe

One of a series of murder mysteries featuring the character Philo Vance. A Lost Movie

Farmer Allen Golyer finds his romance with his naïve sweetheart Susie usurped by Bertie Leon, a traveling salesman. Leon's slick, citified ways win the girl's heart and she leaves Golyer for him . Just then Golyer's friend, Colonel Blood, shows up with a sapling which he presents to him. Leon meanwhile leaves the little country village and is never heard from again. Susie, believing that he was fickle, agrees to marry Golyer. For the next 20 years they are happy, until Golyer goes to a seer.

Jack Lane (William Stowell) has made an invention for photographing wild animals. It consists of a camera with a trigger -- when the trigger is stepped on by a passing animal, a flash goes off and the camera shoots the picture. Lane goes up to the mountains to try out his new contraption. When a recluse refuses to let him spend the night in his cabin, Lane goes to sleep out of doors, with the camera set up near by. In the middle of the night, he is awakened by the flash and the sound of gunshots. Trekking back to his own cabin the next day, he develops the picture, which is of a girl holding a rifle. He returns to the recluse's cabin where he is arrested for murder.

Babs Van Buren saves her lover from the electric chair and at the same time extricates her older sister, Connie from a trying situation.

A Parisian cop sets out to solve a sudden series of crimes, including robbery and blackmail. Based on a novel by Émile Gaboriau.

A poor man refrains from proposing to the woman he loves until he can secure the fortune left him by his uncle. Believing the treasure awaits in his uncle's abandoned mansion, he begins searching... only to uncover mystery, murder, and a killer ape.

Holmes and Watson match wits with an opera star intent on blackmailing a king.

Two men, one of them a villainous hypnotist, contend for the same woman, unaware that she suffers from dual personality disorder.

Millionaire Joshua Barker insists that his daughter, Faith, must marry Phil Langhorne, a man that neither likes, and Faith is in love with and eager to marry her childhood sweetheart, John Temple.

In Dijon, Inspector Hanaud investigates Betty Harlowe after her uncle, Boris Waberski, accuses her of poisoning her wealthy aunt for an inheritance. While an initial autopsy finds nothing, Hanaud discovers the use of Strophanthus Hispidus—a rare, undetectable poison applied via an antique arrow. Amidst a flurry of "poison pen" letters and deception, Hanaud proves the murder occurred despite the lack of conventional medical evidence.

Chaney plays two roles: mad scientist Arthur Lamb and Lamb's "experiment", known only as the Ape Man. This hideous creature was the result of Lamb's attempts to transplant animal glands into human beings. A lost film.

Winthrop Clavering a mystery writer, is continually ridiculed for the fiction of the crimes he depicts, so he decides to solve a case himself. To that end, he determines to find the slayer of Pedro Alvarez, who whispered before dying that his assailant was a woman. At the City Refuge for Homeless Girls, Clavering obtains the assistance of Margaret Holt, the sister of Victor Holt, the district attorney. Margaret, it is revealed, was abducted by Juanita, a member of a gang of white slavers led by Alvarez. After escaping from a brothel, Margaret became Alvarez' stenographer, hoping to gather secret information on his gang. While searching for evidence, Margaret was surprised by Alvarez, whom she killed. Finally, Clavering captures the gang, clears Margaret, and encourages her romance with cub reporter Jack Howell. This film is presumably lost.

An operator at a mobile pager company has her life turned upside down by a seemingly senseless abduction. Currently considered to be a lost film (never released to the general public, after its theatrical premiere in Puerto Rico).

Business partners Bradley and Collier both love Mary. Bradley leads Collier to believe he is engaged to her so Collier prepares to head West when Lola, the young girl Bradley had seduced and abandoned, appears at the office and begs Bradley for help. He spurns her slipping out of the office and making it appear that Collier is the lout. Mary with that perception marries Bradley only to discover by Lola’s deathbed confession that she has been deceived. Tony, Lola's father, crazed by his daughter's death, comes to Bradley's office and the next day Bradley is found dead. When Tony is arrested Collier steps forward to say he confronted Bradley and as they struggled the revolver Bradley drew went off, killing him. Tony is freed and Collier and Mary marry.

Guido, an artist, is obsessed with the desire for the death of Clavering, a rich man who has entered into a forced marriage with Margaret, the girl whom Guido loves. The thought accompanies him in his work, his sleep and fills his every moment. One night, he awakens from a dream in which he has murdered Clavering. The next morning, Clavering is found murdered and Guido labors under the uncanny feeling that he is the murderer. Hoping to relieve Guido's fears, Margaret induces him to paint the picture of his dream. Clavering's butler sees the painting of his dead master, and is so horror stricken that he confesses to murdering Clavering for his money.

After serving fifteen years of a twenty-year prison term for embezzlement, Joe Moore is released early for good behavior. In New York, he finds Matthew Owens and James Horton, his former business associates, and demands that they pay what they owe him.

When Harlan Carr inherited his Uncle Ebenezer's "Jack-O Lantern" house and too his bride there to live, he found himself the unwilling host of a score of hungry relatives within a week. Soon, strange things began to happen. A black cat made the house his headquarters, unexplained sounds could be heard and a shadowy figure floated through the halls at night.

A woman's cheating husband is murdered at their country estate, and suspicion immediately falls on her.

Old Silas Blackburn, a wealthy recluse, lives alone with his butler and his ward Katherine. One night, Katherine discovers Silas murdered in the room where three generations of Blackburns have mysteriously died. Silas' grandson Robert, whom Katherine loves, comes to visit the next day, suffering from amnesia.

The household of Senator Walker consists of himself, his ward, Mary, and his nephew, Herbert. The other members of his household are John, an old servant, Lucy the maid, and a half dozen more servants. John is smitten with Lacy. She doesn't take him seriously, owing to the difference in their ages. Mr. Walker, rather old and feeble, draws up his will and leaves the bulk of his property to Mary and Herbert. He bequeaths $5,000 to his faithful servant John. Herbert is very fond of his uncle. The old gentleman is very much attached to Mary and very desirous that she and Herbert should be wed at the proper time.