What we carry is the collected edition, The Witches of Scotland: The Complete Series, Books 1-8, running to thirty-two hours and seven minutes. Lianne Walker narrates the entire run, which matters in a saga of this length: one voice, one continuous world, no change of register partway through.
It holds a 4.5 rating from close to a thousand listener scores, a strong showing for a self-contained fantasy saga. Start at the opening of the collection and let it carry you along; there is no shortcut into a story built this way. The audiobook is below.