Fate Takes A Hand - Celia Martin Series, #6

Amaryllis Bowdon has spirited her young siblings, the two-year old Sir Charles and six-year old Tabitha, away from their home because she believes their aunt is attempting to kill the young baronet so her own son can become the baronet. In their fearful flight, Amaryllis never expected to be befriended by Lady Selena D'Arcy and her much too handsome brother, Reginald D'Arcy. Reginald is charged with escorting his sister to their uncle's manor in Leicester so their aunt can turnSelena into a true lady.
Reginald doubts such a feat can be accomplished, but despite all Selena might do to slow their progress, which included rescuing an injured dog she names, Fate, Reginald is determined to get his sister to Whimbrel Manor. But when Selena is equally determined to help Amaryllis and her siblings, Reginald finds he is only too happy to readjust his plans. Amaryllis is an angel and do they have to go out of the way to get Sir Charles to safety, then so beit.
But they have no way of knowing Amaryllis's aunt has sent a man to make sure Sir Charles never reaches that safe destination. Keeping Sir Charles from being killed becomes a desperate race.