Tamed By the Marquess by Scarlett Osborne

If love was poison, he’d drink it anyway.
Shunned by society her entire life, Joanna Bagley has been living as a nomad amongst the Travellers of Britain. When her daughter gets seriously ill, she has no other choice but to ask for help from the man that has been haunting her past for years…
Christopher Albertson, now Duke of Gresham, has always been duty-bound, until the death of his domineering father. Knowing no other love than the fair Traveller he fell for many years ago, his life changes unexpectedly when he takes her child under his protection.
But when he gets poisoned, all clues lead to Joanna. With suspicious filters found in her possession, she is thrown in prison, awaiting her horrid fate…
Until her daughter discovers a secret entrance to the Gresham manor that may be the only lead to her mother’s salvation…but who will believe a little Traveller girl?