Here are some cheats and tips for the game Agatha Christie: And Then There Were None.
Safe puzzle:
Once the safe has been opened, inside is a small drawer with slots with the letters A, E (3), H, L, R, S,
T, U, V and W. Notice the poster above the radio just outside the safe. You will find the answer there in
a song that Patrick sings. The answer to open this second hidden door is: Rule the Waves.