Sir Richard Wyndham is wealthy, fashionable and trapped by family expectations that he should make a suitable marriage. Leaving London after a night of drinking, he encounters Pen Creed climbing from a window in boy’s clothing to escape guardians determined to marry her against her will.
Richard agrees to escort Pen towards the man she believes she loves, but their journey becomes entangled with highway robbery, stolen jewels, mistaken identities and murder. Away from London society, the experienced man of fashion and the impulsive runaway discover that neither is as certain of the future as they first appeared.