Some of the original books, which were illustrated by Sir Quentin Blake, had also first been seen as a part of the BBC's Jackanory programmes.
The stories are about a four-year-old girl named Arabel Jones who adopts an injured raven that her Dad, a cab driver named Ebenezer Jones, brings home after finding him injured in the road and christens "Mortimer", but his only communication is to squawk "Nevermore!"
The Jones family live at 6 Rainwater Crescent in Rumbury Town, London NW3½ where most of their neighbours, including Mr. Coughtrack, Mr. and Mrs. Hamstring and especially grumpy old Mr. Leggitt, cannot stand Mortimer due to all the chaos he causes, and it is always up to Arabel to keep Mortimer out of trouble, although he frequently causes chaotic upsets with his mischievous behaviour.
Other characters include Arabel's Mum Martha Jones, Mr. Leggitt's accomplices Bill and Joe, Mayor Saddlejoy and his wife, the Town Hall's secretary Doreen, Sergeant (later Mayor, after Saddlejoy retired from his position at the end of the first series) Cutlink, P.C.
Barnoff, Arabel's babysitter Chris Cross (who was the only one of the Joneses' neighbours to also have a fondness for Mortimer), Mr. Leggitt's pet pigeon Pianono, a Scottish odd-job woman named Flo (known as "Have-A-Go Flo" and "In-The-Know Flo" by Mr. Leggitt's accomplices and "Odd-Job Flo" by Ebenezer), an Indian singer named Seleena, a Greek Professor from the island of Pollyargos, an American millionaire named Mr. Bonny, the Duchess of Skew, a farmer named Mr. Westropp, a herd of Jersey cows named Daisy, Lazy and Maisie, Ebenezer's Mum Granny Jones, Granny Jones's pet cat Augustus, Ebenezer's evil cousin Perce Jones, and a ghost named Sir Humphrey Burbage who haunted Mallards' Bank (a parody of Lloyds Bank, which was managed by a man named Mr. Sterrett and his assistant Miss Gracie, and cleaned by a woman named Mrs. Catchpenny) every night at Christmas until Mortimer and Arabel returned his gold, which he had hidden behind a loose brick with an "H" on in the Tower of London (where he was a prisoner during the day) while he was alive, but he died owing Mallards' Bank a considerable debt.