Following the massive outcry from fans when the series was cancelled, Amazon Prime Video brought back fan favorite Ripper Street. As the fourth season of the crime drama launches exclusively for Amazon Prime members today, here's a reminder to help jog your memory of where the Whitechapel characters are…

Three years have passed in London's East End, the final years of the Victorian age in the high summer of 1897, as Queen Victoria is celebrating her diamond jubilee. DI Edmund Reid has left the force which gave him his career; and the neighbourhood which shaped his life. Long Susan awaits her fate in Newgate Prison, punishment for her part in the Leman Street locomotive disaster of 1894. DI Bennet Drake, is now Head of H Division and is looking into the case of an Indian man found murdered at the docks.

DETECTIVE INSPECTOR EDMUND REID - MATTHEW MACFADYEN

When we last met Reid he was about to embark on a life of quiet contemplation and rest: reunited finally with his long-lost daughter Mathilda and set up to spend his days in retirement in the quiet seaside village of Hampton-on-Sea. That is until old acquaintance (and lover) Deborah Goren turns up, bringing with her the news that their friend Isaac Bloom has been arrested and convicted... Could it be time for Reid to return to Whitechapel?

DETECTIVE INSPECTOR BENNET DRAKE - JEROME FLYNN

Detective Inspector Bennet Drake has come a long way since we first met him. No longer a quick-fisted street boy, he's now risen to the level of Head of H Division. And the success of the Bloom conviction is only one of many that has graced Drake's command since Reid left. He has been worthy of the trust placed in him but as events unfold and the threat of Drake's old boss returning, could this be the end to his success?

CAPTAIN HOMER JACKSON - ADAM ROTHENBERG

In the ever-changing maelstrom that is Whitechapel, it seems some things never change: Captain Homer Jackson chief among them. Indeed to Drake's eyes, the American goes about his business in much the same way he ever did. As the series opens, Jackson's wife, Long Susan Hart, is only weeks away from her execution. Maybe it is just that Jackson cannot cope with the idea, or perhaps, just perhaps, Jackson has another plan entirely…

LONG SUSAN HART - MYANNA BURING

On her sentencing two and a half years ago, she took advantage of the article of English law that allows expectant mothers to 'plead the belly', thereby handing herself a stay of execution. But now there can be no further delay: Long Susan Hart will hang for her part in the deaths of the 55 souls who perished in the Leman Street locomotive disaster of 1894…

ROSE DRAKE - CHARLENE MCKENNA

The interim years have treated Rose Drake, née Erskine, kindly. Finally wife to a man who loves her beyond measure, the marital bliss of the Drake household has been considerable. However, all is not well in Rose's world. Her good friend, Susan Hart, is shortly set to hang. Rose has been Susan's most regular visitor in Newgate Prison, and their relationship has deepened profoundly.

Whitechapel's new faces

ABEL CROKER - DAVID THRELFALL

A man of enormous self-interest but wild charisma, Abel Croker instils loyalty and fear in all who fall into his ambit. There's not a single arrival here - animal, mineral, vegetable or human - he doesn't know about. He can get you a berth on a ship in the blink of an eye, tell you which stevedores have skimmed anything tasty, import, export, contraband… Which might make him sound amiable, roguish even.

ASSISTANT COMMISSIONER AUGUSTUS DOVE - KILLIAN SCOTT

Augustus Dove is, in large part, the reason that H Division has found itself (for a change) the recipient of more funding and positive press coverage. The young Assistant Commissioner is himself, a child of Whitechapel. One of the new breed of ragged school boys come good, his is a precipitate rate of progress.

DESK SERGEANT SAMUEL DRUMMOND - MATTHEW LEWIS

As Edmund Reid before him, Drum understands the high value of rapid access to information. Part of the reason Inspector Drake hired him was because the young man put him in mind of Reid, but Drum has taken Reid's obsession with modernity and raised the bar.

DETECTIVE SERGEANT FRANK THATCHER - BENJAMIN O'MAHONEY

Whitechapel is moving into the modern age but there's still a place for the old school rough and tumble formerly embodied by Drake, in his fighting days. And now there's a new cop in town - Francis Thatcher.

Ripper Street Series 4 will be available exclusively for Amazon Prime members in the UK from 15 January 2016.