I used ChatGPT for this one. Based on the info, the recommendations are: 1. Heart to Heart — Lurlene McDaniel YA novel: a girl’s best friend (Elowyn) dies in a car accident and is an organ donor; the story follows the donor’s friends and the recipient and how lives are changed by the transplant. (Strong match to the “friend dies + transplant” plot).  2. The Heart — Maylis de Kerangal (translated from French) Literary/medical fiction focused almost entirely on the events after a young man dies in a car crash and the transplantation of his heart — it follows donors’ family, medical staff, recipient, etc. (Adult, very transplant-centered).  3. Second-Hand Heart — Catherine Ryan Hyde Contemporary novel where a tragic car accident leads to organ donation and connects the donor’s family with the transplant recipient; explores how the lives of both families become entwined. (Romantic / emotional angle).  4. In a Heartbeat — Loretta Ellsworth YA/teen novel about heart donation/transplant; readers mention it as a sad but heartwarming transplant story (possible match if you remember YA tone).  5. This Heart of Mine — C.C. Hunter (possible peripheral match) Has been suggested in reader communities where a transplanted heart influences personality or feelings — included because some people confuse heart-transfer/“new personality” themes across YA titles. (Check if the “feeling like the donor” piece matches your memory).
1. Heart to Heart — Lurlene McDaniel
YA novel: a girl’s best friend (Elowyn) dies in a car accident and is an organ donor; the story follows the donor’s friends and the recipient and how lives are changed by the transplant. (Strong match to the “friend dies + transplant” plot). 
2. The Heart — Maylis de Kerangal (translated from French)
Literary/medical fiction focused almost entirely on the events after a young man dies in a car crash and the transplantation of his heart — it follows donors’ family, medical staff, recipient, etc. (Adult, very transplant-centered). 
3. Second-Hand Heart — Catherine Ryan Hyde
Contemporary novel where a tragic car accident leads to organ donation and connects the donor’s family with the transplant recipient; explores how the lives of both families become entwined. (Romantic / emotional angle). 
4. In a Heartbeat — Loretta Ellsworth
YA/teen novel about heart donation/transplant; readers mention it as a sad but heartwarming transplant story (possible match if you remember YA tone). 
5. This Heart of Mine — C.C. Hunter (possible peripheral match)
Has been suggested in reader communities where a transplanted heart influences personality or feelings — included because some people confuse heart-transfer/“new personality” themes across YA titles. (Check if the “feeling like the donor” piece matches your memory).