Pouvez vous me corriger et me dire si mon histoire a un sens ?

“What happened, Sarge?” Parker said.
The patrol supervisor read from his notes which come of the testimony told by Stella Ben, a witness:
“M. Ben, a widow and very rich old-man aged 82, who lived in a manor, is a victim. He has one daughter one son who lived near at his home. Also, He has three servants, Alice who devoted to M. Ben, John, a gardener who hates the whole family and Sarah, a cook, who is a poor woman and lived in a nearby cottage. He has just met a woman of 25 years younger than him, Mary Beck, who is interested by money of M.Ben . The last night he was working at his desk like every night. In the meantime he received a visit as we found two cups of coffee on the table since the killer was somebody he knew. But, this morning, when his daughter, Stella Ben, came in for her everyday visit, she discovered her grand-father dead in the living room … We found a knife in the crime scene, near the body, therefore we are presuming the victim was stabbed…the house had been emptied, the money of the old man disappeared ... No one saw Mary …” said is
Several suspects, Alice ? Sarah? John ? Or Mary ?