"The Boy from Yesterday" is a New Adult genre fiction novel, the first from author K.B. Howard.  The story is about a young man, Tom Flannery, 19, who, with the help of a magic ring from a mysterious magician, travels through time from 1890 to the present day, in search of help for a sick friend, Sam Beckins, who has been injured in a horse accident.  In the present day, he meets Laurel Humphrey, also 20, a student at Chesterfield University in New England.  Tom fights to find help for his friend and return to his own time before it's too late and Sam, all his progeny (including Laurel!) and time itself are altered forever.  (copyright 2020, K.B. Howard, all rights reserved)