You think that we are lukewarm, that we lack fire and energy, but trust me, it is not so." John stuck his head in at this juncture, and invited us both to come up to Mrs. Inglethorp's room, as he and Mr. Wells had finished looking through the desk in the boudoir. 
We were invited up to Mrs. Inglethorp's room by John. 
The desk that John and Mr. Wells had been rummaging through was in Mrs. Inglethorps room. 