In which Martin Arrowsmith, immersed in the rigours of medical training and original research, finds himself unexpectedly drawn into the company of Leora Tozer, a spirited and candid probationer nurse whose easy companionship contrasts sharply with his more proper fiancée Madeline Fox. Against the backdrop of hospital corridors and genteel society lunches, Martin navigates the complexities of youthful affection and ambition with an earnest if somewhat befuddled heart.