“Well,” Mason told him, avoiding Della Street’s eyes, “we’ll cross that bridge when we come to it. Anything else new?”

“Yes,” Della said. “Rodney Wenston’s waiting in the office. There’s a woman with him who claims to be the daughter of Karr’s partner. Wenston thinks she’s an impostor, and wants you to trap her.”

“Has she seen Karr?”

“No. Karr arranged with Wenston to answer the phone and handle all calls that came in on that ad. Wenston says that unless she can really produce some evidence, he’s not even going to let her talk with Karr. He said he was against Karr’s putting that ad in the paper. He says it’s certain to attract swindlers. He thought that if Karr wanted to do anything, he should quietly engage a firm of private detectives to find out what had happened to the daughter. Karr got impatient and said he couldn’t wait.”

“Where is this woman now?” Mason asked.

“Waiting in the office with Wenston. He hasn’t let her tell her story. He wants you to be with him the first time she tells it.”

Drake said, “There’s one other thing, Perry.”

“What?”

“Wenston acts the part of the wealthy playboy. He has quite a place down between Culver City and Santa Monica. There’s a hangar and a swell little private landing field. He flies back and forth to San Francisco quite a lot. Guess who he has for a passenger on nearly all of the trips?”

“Karr?” Mason asked.