A successful time-travel romance must have the characters react logically to their experience and should investigate some of the differences, both physical and mental, between the world the character normally inhabits and the one where they landed.

Because time-travel romances involve both science fiction and relationships, these stories appeal to a much broader audience than, say, a film with long, loving shots of spaceships or alien bugs.

That is the mature time-travel romance.

Jack Finney, who died in 1995, made a cottage industry of time-travel romances, and his work looms behind many time-travel movies.

She has written several time-travel romances, and her latest novels have had a contemporary setting.

Three days later, she sold her debut novel, a time-travel romance called Wings of the Storm.

Julie Cross's debut teen novel is an action-packed time-travel romance.

Many of her novels are paranormal or time-travel romances.

Prisoner of Time (1998) is the third in a series of time-travel romances written by Caroline B. Cooney.

Podcast: Michael Morpurgo on War Horse Julie Cross's debut teen novel is an action-packed time-travel romance.