Serendipity
Pure chemistry!

That Marcus Blackmore and Ann Somerton first met in a laboratory was fitting - they were about to become living proof that opposites do attract. Though it took a small mouse named Serendipity to mix things up, nature them took over...

Which is how a highly organized cleaning woman fell in love and moved in with an absentminded scientist. And how, after further investigation, they discovered there was nothing more elemental than their need for each other.