The Grade-II listed townhouse where Mary Shelley completed her renowned novel is on the market for offers over £800,000.

Located in Marlow, Buckinghamshire, the three-bedroom property was once part of the home the author shared with her husband and poet, Percy Bysshe Shelley.

Mary and Percy moved into Albion House shortly after marrying in March 1817, and remained there for nearly a year.

The author, then aged just 19, had begun writing during a famously gloomy summer in Switzerland the previous year.

She completed the novel while living in Marlow, before it was published anonymously on 1 January 1818.

The house was also a creative retreat for Percy, who worked on some of his best-known poetry during their stay.

When the Shelleys moved into the original Albion House, their household also included Mary's stepsister Claire Clairmont, children and servants.

During the couple's stay, Mary also gave birth to her and Percy’s daughter Clara in September 1817.

But life wasn't entirely idyllic. Despite its picturesque surroundings, Mary reportedly found the property cold and damp, while the couple also struggled financially.

The Shelleys' stay in Marlow proved short-lived. They left England for Italy in March 1818, just months after was published.

The historic building was subsequently divided into four homes, including the three-storey Shelley Cottage, which is now being sold by Bonners & Babingtons.

Dating in part to the 18th century, the property retains exposed wooden beams, fireplaces and a distinctive white exterior.

It offers approximately 1,177 sq ft of accommodation, with three bedrooms, a modern kitchen and an enclosed courtyard garden.

The chain-free home, on West Street, has had its asking price reduced and is now available for offers over £800,000.

A plaque outside the property commemorates the famous couple, who lived here between 1817 and 1818.

According to the estate agent, the site may originally have been occupied by a late 16th-century house, before being rebuilt during the 18th century.

Behind the historic exterior is a bright sitting room with white armchairs, a sofa, wooden flooring and a fireplace.

The attractive hallway features herringbone-style wooden flooring, rustic doors and a wine rack tucked beneath a counter.

The kitchen is a far cry from the facilities available during the Shelleys' time, boasting grey cabinetry, a substantial range cooker and a dining table.

A glazed roof floods the room with natural light, creating an airy contrast to the period features found elsewhere in the historic property.

One of the bedrooms features an ornate cast-iron fireplace, shuttered windows and a large double bed.

Although the interiors have been modernised, details like these evoke the property's earlier life, while built-in bookshelves, framed artwork and a distinctive tiger-patterned rug give this bedroom a literary feel.

A further bedroom is tucked beneath the sloping roof, with white-painted beams, a small shuttered window and a cosy double bed.

The bathroom reveals a fitted bathtub with overhead shower, white mosaic wall tiles and a traditional sash-style window.

A timber outbuilding provides additional storage, while the town centre and River Thames are close by.