The Fortec Conspiracy(1968)
A novel by Edmond G Addeo and Richard M Garvin
Fortec is a super-secret inner sanctum where it is rumored that three aliens, recovered from a crashed saucer in Norway, were being kept. Barney Russom believes the reported suicide of his twin brother, a researcher at Fortec, has something to do with the downed saucer story and goes off, sniffing like a bloodhound.
Used availability for Edmond G Addeo's The Fortec Conspiracy