Three days a week she is a high-flying City lawyer. The rest of the time, she spends in a world run by cats - a fantasy world of course.
Ms Iserles, 35, is an award-winning children's writer and she has recently published her latest book, The Tygrine Cat On the Run.
A sequel to her debut novel The Tygrine Cat, it is the story of two cat tribes and in particular, Mati, the last of the Tygrine tribe, who must protect his feline friends from danger.
It is set at market-place Cressida Lock, loosely based on north London's Camden Lock.