Ellen O'Casey, an Irish Catholic immigrant, is struggling to support her ailing mother, her teenage daughter and herself. Washing other people's laundry in the day, and singing in bawdy pubs at night, Ellen is determined to make a better life for her family by saving enough for the passage to New York where the rest of her extended family have already emigrated. But Danny Donovan, a local gangster and the landlord of the pubs where Ellen sings, intends to make her his mistress.

As war rages, Barbara Sinclair is desperate to escape her unhappy home life. And with the threat of German bombs ever present, Barbara reluctantly agrees to marry John, her childhood friend, who is leaving to join the RAF. But an encounter with Alex Everton, a dashing Spitfire pilot, complicates matters for Barbara. With emotions running high, she begins to question whether she has made a terrible mistake. With the constant threat of death all around her, Barbara must try to find a way to deal with the complexities of her difficult home life and her emotional relationships, too.

East London, 1940. At the outbreak of war, hopeless romantic Prue Carmichael and her sister must leave their rural parish behind when their father is posted to a church in Stepney. To Prue, the blitz-ravaged streets of London seem an unlikely place for love to bloom – until a chance encounter throws rakish engineer Jack Quinn into her path. But as their connection deepens, his troubled past begins to emerge, and Prue realises Jack has secrets to hide.

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.

It's 1939, and the Brogan family of London's East End are ready to show Hitler what for. But things don't seem so rosy when rationing, evacuation and air raids start to put this larger-than-life family to the test. When a mysterious young man arrives at the Brogans' local parish church, he provides just the dazzling distraction they need - and, for eldest daughter Mattie, the promise of more than she'd ever wished for. But as the pair fall deeper in love, they are drawn into secret dangers, rife on the very London streets they call home.