therein

[thair-in]
adverb
1.
in or into that place or thing.
2.
in that matter, circumstance, etc.

Origin:
before 1000; Middle English therin, Old English thǣrin. See there, in

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World English Dictionary
therein (ˌðɛərˈɪn)
 
adv
formal in or into that place, thing, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

therein
O.E. þærin; see there + in.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Therein lies the paradox of the natural-gas powered car.
Therein lays the benefit because to their own self-interest they're going to
  keep that thing immaculately clean.
It's face-on to us, allowing us to see its magnificent spiral arms and all the
  structure therein.
And therein lies the peculiar and precise horror of parasites.
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