How Louis Mayerling explains (almost) every phenomena at Borley, and how he was personally involved in (almost) every explanation

Alleged phenomena Mayerling explanation
Sisters see nun, 28 July 1900 The sisters were under the influence of wine made by the maid - who accompanied them.
Henry walled up the window to keep the nun from peering inside. "A simple-minded young woman known as Little Maddie," who looked into many windows in the hamlet, and to whom Mayerling presented a gift. Or, to conserve heat. Or, to avoid the "window tax."
The nun, on her "walk." A servant girl on the way to Liston. Any number of "locals" it as a short cut.
Cartwright sees Sister of Mercy, autumn of 1927 Mayerling talked to Cartwright and "had no doubt as to the veracity of his belief."
Ghostly apparitions of a horse and carriage. A "gigantic [magic lantern] projector" which included a single slide - of a western stage coach.
Various noises Dormice always resided in the attics
Sibilant whisperings heard by the Smiths, including "Don't Carlos, don't." 1. One of several wireless sets (radios) made by Mayerling and given to servants and others.
2. A scullery maid resisting the advances of a traveling butcher's boy.
"Pattering dog steps." "In spite of statements to the contrary, the house had always supported a bevy of cats and dogs."
"Overpowering scent of incense." An overweight mongrel dog with a "horrifying array of rotten teeth and gums," mixed with the "inscrutable odours of the house."
The skull found by Mrs. Smith. A plaster model, probably left behind by Basil, or some other medical student. Label read by Mayerling as, "London Hosp. Med. Sch. E1."
A light seen in room number 7 The reflection of an oil lamp in the stable - held at a certain point by a hoaxer.
Sign of the cross seen in an [unidentified] window Aging of the glass reflecting horizontal light.
Various "dragging footsteps" The back door was left unlocked to accommodate any passer-by needing to visit the bathroom.
Moving lights inside the church. Tractor lights during night-time ploughing..
Sounds during first seance with Price and the Smiths. Mr. Gardner, staying in the stable cottage, shouted and tapped a pole on the window to ask for quiet so he could sleep. He also threw stones through an open window.
Various sounds and "echoes." Unique acoustics that carried sounds through several inner walls, the stone wall outside, the cellars and the tunnels .
Bell ringing. "Activated by prodding the bells through the barred window over the well in the kitchen passage. In addition, they could be sounded by pulling some of the loose wiring with cord from the pantry grille just six feet away." Marianne hid in a pantry and poked them with a walking stick through a vent. There was also a string and clip affair developed by Mayerling - after ringing the bells, the string would be pulled firmly, releasing the clip and allowing the string to be pulled out of sight.
Organ playing at night when the church was closed. Mayerling or a "local boy" practicing.
Humming noises and "clanking thuds." Air locks in the Ascot water heating system. Once discovered, used by the Foysters to fool guests.
Sightings of a headless monk - the nun. George Carter strolling in one of Lionel's cassocks at dusk. Initially sighted by accident, Carter repeated the performance "whenever the presence of sightseers was suspected." Mayerling is upset he never received credit for his dramatics.
Fires in the baseboards. Stuffing a phosphorous candle into rat holes. Price knew about the candles and told Mayerling to "Forget it."
Flying objects. One of the Foysters servants, Cathie, flipped bottle caps with a rubber band.
Wall writings. Children's scribbles. Sea-sand had been used in the construction of the inner walls, which was permanently damp. This caused a succession of wallpapers to peel off, exposing former patterns. Lionel, in a state of "disturbed melancholia." Mayerling himself.
Voices, some calling "Mary Anne. A talking bird owned by a boy named Jed. Price knew this.
Floating plates. A length of rubber tubing and a bulb placed under the tablecloth. The "plate-lifter" was "much in vogue" at the time.
Changing wine to ink. A trick used by an unknown girl, and by Price.
Appearing bottles. Bursting of home-made wine bottles.
Frightful sigh in the church. The organ bellows responding to temperature changes. Recorded in 1974, Mayerling camped out with Father O'Neal in the 30's, and heard the same groan.
"Moving" screen witnessed by Glanville. Threaded with balsa wood, and so light, that even the draught from a cigarette would cause it to move.
The cold spot outside the Blue Room. Mayerling could feel no temperature dip, but did notice a small ventilation duct leading to the courtyard. Price was aware of Mayerling's discovery, but ignored it.
A sunken area -subsidence - in the cellar found by Glanville. Former location of a five foot tall safe "secured by heavy bolts cemented into the ground" by Henry Bull. Used by both Henry and Harry to store valuables, including the communion cup. Georgie Carter was sometimes allowed to open the safe and procure the cup.
Kerr-Pearse locked inside the library - the key being inside the room. The lock had been replaced several times and the original aperture "had become too large and shapeless," allowing any trickster to push the key through the hole from the other side of the door. Additionally, the key may have been half- turned, and later finished turning on its own volition, as a half-thrown light switch will do. .
Keys jumping from locks. Pulled with a looped string, which was then pulled to the hoaxer after displacing itself from the key when yanked.
Movement of various objects outside the Blue Room. Items on ledges were subject to the looped string trick.
Various noise during the Price tenancy. Mayerling letting himself in through a balky scullery door. He made several noises walking through the darkened halls and rooms. He slept, and as he left, repositioned the security tape he had disturbed earlier.
Various noises over the years. Large amount of animals about the place.
Smell of burning wood. "Ghostly clicks and rappings." The old heating stove in the entry hall, which scorched the banister, and creaked.
Mysterious vapor, perhaps a "flying nun." Swarms of gnats or flies.
Matchsticks floating in the bathwater. Pushed through cracks in the ceiling by pranksters.
Gregson's dog bounded away, never to return. Mayerling blew a dog whistle.
The floating brick taken by a LIFE photographer, April 5, 1944. Collusion between Price and the photographer. Mayerling displays his version by painting on a negative.