Edgar Wallace 
Sinister Man [PDF ebook] 

Jessie Dame calls Major Amery ‘The Sinister Man’. Secretary Ella Marlowe is the ward of Maurice Tarn, who has drunkenly but seriously proposed. Tarn is going abroad and desires the company of someone he can trust. Though sworn to secrecy, the horrified Ella confesses everything to Ralph Hallam. Looking pale and unkempt Maurice arrives at the office to apologise to Major Amery for losing his temper — they talk: the Stanford Corporation is mentioned, along with drugs and gangs…