Agatha Christie: And Then There Were None Cheats - PC
Hints
Safe puzzle
Once the safe has been opened, inside is a small drawer with slots with the letters A, E, E, E, 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.