Expires 4 months after purchase. Limit 1 per 1 or 2 people. Mandatory booking required at mysterywalks1@gmail.com. 72-hour cancellation policy. Present Groupon on arrival. Under 18 must be accompanied by an adult. Must wear weather appropriate clothing and comfortable shoes. Not suitable for those with walking problems or those who are easily scared. Step-free access available. Meeting point: outside exit 2 of St Paul's station. Valid Thu, 8pm (Ghosts and Executions), Mon, Wed, Fri, Sun 7pm (Jack the Ripper). Valid for option purchased only. Merchant is solely responsible to purchasers for the care and quality of the advertised products and services.