Miguel's sister Tiana lied to Finn and Bruno when she told them she had no idea her brother liked prostitutes. Later they discover she had been previously questioned by police when her brother was a suspect in three other cases of prostitutes being assaulted and raped, she provided her brother with an alibi for each one. She clearly knew that her brother liked prostitutes, yet none of the detectives mention this, nor do they ask Tiana about it or use it as leverage against her.