So investigators initially pursue paper trails, checking on a tenant's voter registration, telephone records, even dog licenses.
In the Khobar Towers case, neither the Saudis nor the State Department seemed eager to pursue a trail of evidence that pointed to Iranian terrorists as the likeliest perpetrators.
"These helmets are like a page torn from a book," said Martín Almagro-Gorbea, president of Spain's Royal History Academy, who pressed the Spanish government to pursue the trail of the two helmets that were put up for auction in 2008.
The Gunmen refuse to believe the evidence, especially when they find that Fletcher provided it, although the agents continue to pursue the trail.
A corpse found in a local park is just the first in a series of dead bodies that leads a thoughtful federal prosecutor to pursue a trail of thieves, murderers and child pornographers in this legal thriller.
The Countryside Alliance confirmed the resurgence in the number of hunters, estimating that at least 45,000 people are likely to take to the lanes and fields of England this year to pursue "drags" or "trails" – usually made by dipping rags in fox urine, sometimes imported from the US, and dragging them along on long poles.
Prosecutors have pursued the trail of so-called conflict diamonds, charging that Mr. Taylor used them to enrich himself and to trade for arms.
Inside his otherwise ordinary apartment lay an intricate series of explosive booby traps, seemingly designed to kill anyone who entered while pursuing his trail.
(A veteran journalist, Jefferson Morley, has been pursuing the trail of a now dead C.I.A. agent named George Joannides through a Freedom of Information Act lawsuit, believing that, at a minimum, the C.I.A. was keeping a much sharper eye on Oswald than it ever wanted known. Relevant documents are supposed to be released in 2017).
At his trial in The Hague, Mr. Taylor's prosecutors have been pursuing the trail of so-called conflict diamonds, seeking to demonstrate that he had diamonds in South Africa while on an arms-buying trip related to fighting in Sierra Leone that cost 200,000 lives.
