here is MaGtRo's walkthrough:
Kitchen - Go to the Kitchen and watch the cook imbibe while cooking. Look at the pegboard by the door and see a hook and key. Talk to Stephen Klausmann, the cook about his past life as a sailor. He mourns the destruction of his ship Aurelius. He has some interesting things to say about the caretaker and gardener's house. (Bring Victoria into the kitchen by pressing Tab and then click on her picture). Give the cook the bottle of wine (open inventory, select wine, right click, close window, click on cook). Darrel will invite him to drink by the table. The cook recounts his problems and drinks. Midway the drinking bout, Victoria takes the keys from the peg by the door. (9:45 AM, +15 mins) To take the keys from Victoria's inventory - press Tab, click telephone, click Darrel's name (will change to Victoria's name) click on Cook's keys, click on Victoria's name and see that under Darrel's inventory the keys are transferred.