How can I find the whereabouts of a specific person?

I am playing in D&D 4e campaign, and in this campaign my character is looking for a specific individual. My PC knows this individual (they were/are married) very well, and has a part of the target’s body (a lock of hair). I’d like to find this individual, using either spells (wizard or other classes), rituals, magic items, or any another technique, as long as it can be found in some D&D rulebook.

I most likely cannot track this person via mundane means, because they could be anywhere on the entire continent.

For context, my PC is level 8, but I am also willing to hear answers that apply to higher levels, so that I can plan on using them once I reach those levels.

Are there any spells, rituals, magic items, or other techniques that can be used to locate or contact a person whose whereabouts I do now know?