tonight's tale begins in tennessee, where molly martens grew up. while knoxville feels like home today, it is a place molly once ran from after struggles during college. >> i was planning on being a doctor. but really, for the first time in my life, school was hard. you know, i hadn't ever really had to study before. so that was a challenge. >> reporter: there were other challenges. migraines, bouts with depression and general anxiety about her future. molly kept it all inside. >> i thought maybe i would just go somewhere, you know, and figure myself out for a while. >> reporter: she signs up with a nanny agency and soon receives an inquiry from a man in desperate need. >> jason corbett, who sent me messages requesting that i contact him regarding his children, it was emotional. he had lost his wife. and they were two babies. >> reporter: at age 24, the one inspiring doctor throws caution to the wind and takes the job offered by the irish widower. >> i arrive in ireland, and it's beautiful. >> reporter: so jason's family say that you guys hit it off