At the start of a case in 2016, Holland & Knight attorneys Eduardo A. Ramos and Daniel P. Hanlon faced a key dilemma: how to prove their client’s elderly father had fallen under the spell of a woman more than two decades his junior.

And then they got the tape — a voice-mail message that recorded after the callers apparently thought they’d hung up. An irate woman pushes the father of the Holland & Knight client to pressure an attorney to change trust documents in her favor.