SOLVED!: Four ??? or ??? Four [s]

[Jude]

Two word title of a book (fiction). Main character worked for some kind of secret service. His name I think was Nick. He had a mission to find an ex lover who had purposely disappeared in USA. I started this book in a waiting room thinking I could drop it, now I can't stop wondering how it finished. Please help.

[Jonnynsb]

I think your book is "Crisis Four" by Andy McNab. The hero's name is Nick Stone, an ex-SAS man, and the ex-lover he's trying to find is Sarah, who goes missing from her apartment in Washington, D.C..

[Jude]

Thanks! That's it.