The series is billed as "a comedy about serious things - a pacey, brutally honest, and uncompromisingly funny exposé of the realities of being an Irish sister".
Set in Dublin, it follows the trials and tribulations of Anna, Rachel, Maggie, Claire, and Helen, backed by "a devout mother and a bemused father", as they "navigate the peaks and troughs of their late 20s and 30s".
"This is a sisterhood full of in-jokes, hand-me-down resentments, and more than a few old wounds," the synopsis continues.
"But their DNA, history, and shared love of power ballads keep the Walsh sisters together in the face of heartbreak, grief, addiction, and parenthood."
Author and screenwriter Stefanie Preissner (Can't Cope, Won't Cope) has adapted the novels and leads the writing team on the first four episodes. Kefi Chadwick (Rivals, Death in Paradise) completes the writing team on the remaining two episodes.
The Walsh Sisters is produced by the Bray-based Metropolitan Films International and the London-based Cuba Pictures in association with Fís Éireann/Screen Ireland and the BBC. Cineflix Rights is the exclusive worldwide distribution partner.
Commenting, author Keyes said: "This is SO exciting!!!! I'm beside myself! I love the scripts; they've really kept the spirit of the books. It's been almost impossible to keep this a secret and it's a great feeling that the news is now out in the world."
Screenwriter Preissner said: "It was such an honour to be asked to adapt Marian's amazing books. Rachel's Holiday was the first book I ever bought with my own money, and she has lived in my heart since that day. The team at Cuba are a joy and the whole process has been gorgeous. I cannot wait for everyone to see the magic we are making."
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