Locked up in the desk in the boudoir, they found a will of Mrs. Inglethorp's, dated before her marriage, leaving her fortune to Alfred Inglethorp. 
They found Mrs. Inglethorp's will, which left all her fortune to Alfred Inglethorp.
mnli hypothesis: They found Mrs. Inglethorp's will, which left all her fortune to Alfred Inglethorp. premise: Locked up in the desk in the boudoir, they found a will of Mrs. Inglethorp's, dated before her marriage, leaving her fortune to Alfred Inglethorp. 