(Oakland): Inkshares, (2018 - 2022). First edition of Castle's debut young-adult novel, THE SECLUSION, together with its exciting conclusion, THE CHASM. Two volumes. Paperback originals, EACH VOLUME SIGNED BY CASTLE on title page. The first volume was winner of the 2018 Foreword INDIES Book of the Year in Science Fiction; North Carolina Author Project Winner (in collaboration with Library Journal and BiblioBoard); and Kirkus Reviews Best Science Fiction Book of September 2018. 8vo pictorial paperbacks; 295 pp. & 290 pp., respectively. Both volumes are in fine condition. The first one has scarce pre-publication bookmark with working title THE WALLS ARE CLOSING IN laid in (together with post-publication one with title change).