Willard, the daughter of magician Harry Willard (1896–1970), began performing as a teenager although she had assisted with her father's Willard the Wizard shows as early as age six. Her first illusion was reminiscent of the Davenport Brothers' box illusion, a trademark illusion that she and Falkenstein continue to perform. Willard is apparently secured to a chair inside a curtained cabinet. When the curtain is closed, objects inside the cabinet fly about, but when the curtain is opened again, she continues to be restrained to the chair. To conclude the illusion, a male spectator joins her in the box. When the curtain opens, Willard is wearing the spectator's jacket and he has a bucket over his head, yet she remains tied to the chair.
The mentalism routine that Willard and Falkenstein perform has been compared to the classic routines of Julius and Agnes Zancig and the Piddingtons.
In 1991, Willard and Falkenstein received the Dunninger Award for their "outstanding professionalism and proficiency in the performance of mentalism". At the end of each of their shows, Willard and Falkenstein are always careful to assure the audience that they do not support any belief in spiritualism or the supernatural.
Frances stopped performing while she was raising her children but in 1978 she was invited to re-create the Spirit Cabinet act with magician Carl Beck in Los Angeles. Following those shows she was invited to perform with Falkenstein at Milt Larsens' It's Magic show the same year. That led to an ongoing professional and personal partnership.