Officers are growing increasingly concerned for the welfare of a woman who has gone missing from the Berkhamsted area.
Alice, 37 and from Zimbabwe, was last seen at 6pm on Easter Sunday (April 17).
She is slim, 5ft 6in, and was wearing a grey hoodie with black leggings when last seen.
Police are appealing for people to call 999 immediately if they believe they are with Alice now or have seen her in the last few moments
Anyone with information is asked to contact police online or call 101.