Following its American success , Frohman booked Secret Service to open at the Adelphi Theatre on the West End in London on May 15 , 1897 .
It became the cornerstone of Frohman 's achievements in England .
Following its American success , Frohman booked Secret Service to open at the Adelphi Theatre on the West End in London on May 15 , 1897 , and it became the cornerstone of Frohman 's achievements in England .