Geneva Tourism. Rue du Mont-Blanc 18 1211 Geneva Phone: +41 22 909 70 00 Email: email@example.com The investigation may be conducted by one or more persons. The book costs 21 CHF and includes tickets for the places to visit for one person. If several persons want to play the game together, it is recommanded to have a book for a group of 4 to 5 people maximum. For them, tickets for all the places to visit can be purchased for 7 CHF per person. The Geneva Mystery can not be done on Monday, some museums to visit are closed that day.