Pearl has given up on her dreams of being a journalist after being denied a promotion because of her gender. Joining the WAAF as a radio telephone operator for Bomber Command, Pearl's new job at RAF Fenthorpe serves two purposes – providing an income for her grandmother, and keeping a close eye on her younger sister, Thea, an instrument repairer at another Lincolnshire bomber station.

Autumn 1941, and as female conscription looms, three women arrive at the Bell Works Factory in Hucknall to work on the Spitfire production line. Lily soon realises her real dream is to pilot the planes; Edna longs to be reunited with her evacuee daughter, but soon discovers she has a much bigger problem; and Jeannie fears the worst after weeks of no news from her fiancé. Despite all the heartache, with a bit of festive cheer and 'can do' attitude, The Engine Girls will pull together and do all they can to ensure Britain's safe for the New Year.

Laura Collins is struggling to make a good life for her daughters, Tess and Tina. So when she is offered a good job, with accommodation, she is delighted. Life is very different for the Brewsters who live on Manor Farm in Herefordshire. Danny plans to marry one day so that he can take over the farm, whilst his cousin, Phil, longs to escape the world of farming as soon as possible. War changes all their plans.

August 1940: As the Luftwaffe swarm over Liverpool, Shane Quinn decides to move his family back to the safety of Ireland. But his only child, the beautiful Dana, would rather stay and serve her country than flee to a foreign land. Determined to make it on her own, she joins the WAAF with newfound pals Patty and Lucy. There’s plenty of excitement to be had on a RAF station, even a chance or two at love.

It's 1938, and Cadi is chosen to be Rose Queen in the annual Rose Fete. She is thrilled to be treated like royalty for the day. But deep down she is desperate to leave the Welsh mining community where she grew up. When war is declared, Cadi and her best friend, Poppy, see a chance to escape. Cadi leaves behind her parents and local boy Aled, whom she is meant to marry, for Liverpool.

Nell Whitaker is 15 when war breaks out and her mother sends her to live with her Auntie Kath in a remote farmhouse on Anglesey. At first Nell hates it, but her friendship with Bryn, who works on the farm whilst waiting for his call-up papers, helps a lot. So when he leaves to join his ship, Nell is counting the days to his return. But her heart is broken when news reaches her that Bryn’s ship has been bombed and he has been drowned. Determined to bury her grief in hard work, Nell finds herself growing closer to Auntie Kath.

Marianne seems to have everything. She is married to a handsome Naval officer, Neil Sheridan. They have a daughter, Libby, and a beautiful home near Prince's Park in Liverpool. When war comes, Marianne takes war work and moves in with her mother, Mrs Wainwright, and younger sister. Neil disapproves because the Wainwrights live close to the docks, which are bound to be a bombing target, but Marianne is firm.

Liverpool, 1942. Though they may be posted miles apart, Cadi and Jez's love for one another is stronger than ever—until Cadi receives a heart-breaking call from Jez's base. Cadi races to be with her beau and at his bedside, they make each other a promise before they say their goodbyes. In her darkest hour, Cadi is comforted by her friends and with their support and guidance she begins to see a light at the end of the tunnel. But Cadi will face more than one unexpected turn along the way.

Following a humiliating experience involving the man she thought she’d marry, Iris Tredwick signs up to the Wrens in order to escape and - hopefully - find ‘the right sort’ of man to please her mother. After a bumpy start, Iris manages to befriend outspoken Mary and dreamer Sally as they are sent to their first posting - in Orkney. There she meets engineer Rob, whose flirtatious nature both charms and confounds straight-laced Iris. Much more appropriate for her is local doctor Stewart, if only she felt the same spark for him as she does for Rob.

It is 1939, and working-class Evie Bishop has received a scholarship to study mathematics at Oxford when tragedy turns her life upside down. Evie must seek a new future for herself and, inspired to contribute to the war effort, joins the Women’s Auxiliary Air Force as an Ops Room plotter. Posted to a fighter station on the Sussex Coast, Evie befriends two other WAAFs. But the German bombers seem to know more than they should about the base’s operations, and soon Evie, May and Jess are caught up in a world more dangerous than they ever imagined.