interquel

Etymology
Patterned after prequel, as pre- meaning "before" and inter- meaning "between."

Noun

 * 1)  An installment in a series of works set chronologically between two of its predecessors.
 * 2)  Any middle sequel with an earlier and a later installment. This usage may not be proper.

Quotations

 * 2006 June 25, quoted by Simon Carless (June 27), “Writing Up Trilby's Notes”, Game Set Watch, at
 * The game is a direct sequel to 5 Days a Stranger and an interquel between 5DaS and 7 Days a Skeptic
 * 2006 June 25, quoted by Simon Carless (June 27), “Writing Up Trilby's Notes”, Game Set Watch, at
 * The game is a direct sequel to 5 Days a Stranger and an interquel between 5DaS and 7 Days a Skeptic
 * 2006 June 25, quoted by Simon Carless (June 27), “Writing Up Trilby's Notes”, Game Set Watch, at
 * The game is a direct sequel to 5 Days a Stranger and an interquel between 5DaS and 7 Days a Skeptic
 * 2006 June 25, quoted by Simon Carless (June 27), “Writing Up Trilby's Notes”, Game Set Watch, at
 * The game is a direct sequel to 5 Days a Stranger and an interquel between 5DaS and 7 Days a Skeptic