| 
       There 
        were five Millennium book titles (that I'm aware of) by Harper Collins, 
        though finding them is a challenge as there is speculation that Books 
        3 to 5 were not published in English. The TV series was the invention 
        of X-Files creator Chris Carter and lasted for 
        three seasons. 
    UPDATE : I have since acquired an Italian edition of 'Weeds' dated 1998 published by Mondadori Books and it is numbered as Book 3.  | 
  
  
  Harper 
  Collins Books 
  
|  
         No 
          1 (1997) 
      ![]() The Frenchman  | 
       
         No 
          2 (1997) 
      ![]() Gehenna  | 
    
|  
         1998 
      ![]() The Wild and the Innocent  | 
       
         1998 
      ![]() Force Majeure  | 
       
         2000 
      ![]() Weeds  | 
    
Mondadori Books (Italy)
|  
           No 
            1 (1997) 
        ![]() Il Francese (French) Italian edition of "The Frenchman"  | 
         
           No 
            2 (1997) 
        ![]() Gehenna (Gehenna) Italian edition of "Gehenna"  | 
         
           No 
            3 (1998) 
        ![]() Il Purificatore (The Air Purifier) Italian editon of "Weeds"  | 
      
(Germany)
|  
             No 
              3 (1998) 
          ![]() Die Sünden der Väter (The Sins of the Father) German edition of "Weeds" in hardback  |