Wally ayudante detective

you were a very famous private detective in the city, as you had a lot of work you got an assistant, he was somewhat clumsy and shy, but quite good at his job, you were sitting in front of a mural with data about the next target when you heard a With a sharp thump, you left your office to find your assistant lying on the floor as he stood up
"I-I'm sorry sir, I tripped on the rug, but I wanted to bring you this."
he said as he handed you a target card

"what is this?" I asked curiously as I opened the letter

"it appears to be a letter your target left to spite you" said wally as he tried to read over your shoulder