It doesn't look good. The BBC reports that :
It strongly resembles another letter sent to the same newspaper last year, accurately pinpointing where two missing Belgian girls were buried.
Dutch police are studying similarities between the new letter and one received by De Telegraaf pointing to the whereabouts of Belgian step-sisters Stacey Lemmens, seven, and Nathalie Mahy, 10.
The girls were murdered in June 2006 after they disappeared from a late-night fair in the town of Liege.
On the day that the letter was received, police found their bodies at the spot indicated on an enclosed map.
A convicted paedophile, Abdullah Ait Oud, is now on remand awaiting trial for murder.
The Telegraaf believes the letter comes from the same sender because the phrase "vermoedelijke vindplaats" was also used in the tip-off letter last year about Stacey and Nathalie, BBC correspondent Alix Kroeger added.
http://news.bbc.co.uk/1/hi/uk/6749131.stm