What actually happened..

 "I'm really grateful to you for saving me from that guy. But how did you know all this, Rose?" Carl asked this morning when Rose returned to visit him.

 "May I confess something to you?" Rose asked sounding awkward at this point. Rose reached for something that was under Carl's bed.

 "I'm sorry. I installed this bug," said Rose, lowering her head at this time.

 "What are you doing all this for?" asked Carl looking so worried.

 "I just found out the last few days that you are Marco's mother as well as James," answered Rose sounding sad. The woman dared herself to look at Carl at this time.

 "I decided to do all this to make sure that you are not on the side of the two men. I mean, I know they are members of your family. But, this is a serious matter, Carl. They killed my boyfriend and sister," said Rose, now dripping with water. his eyes.