After receiving the approval of Miss Hudson, landlady of 221B Baker Street, John H. Watson, recently returned from the Afghan War, becomes the housemate of consulting detective Sherlock Holmes, who himself is soon implicated in a serious crime.
This is a new agent that only reacts
and precipitates with blood.
.إنه هذه مادة جديدة تتفاعل وتترسّب مع الدم فقط
Ein neues Mittel, welches nur auf Blut
reagiert und dieses sich absetzen lässt.
Es un nuevo agente que solo reacciona
y se precipita con sangre.
D’un nouveau produit
réagissant uniquement au sang.
É um novo agente que só reage
e se precipita com sangue.
Я нашёл реактив,
 который осаждается только гемоглобином.