Stowaway

The fourth story in the series is titled "Stowaway". It's preceeded by "Under Pressure" and followed by "Taming Hearts".

Synopsis
Growing Up Haddock Story 4: In the midst of family turmoil, Hiccup and Astrid's son decides to take matters into his own hands and soon gets way more than he bargained for. Now it's up to his father to save him from a terrible fate... if Hiccup can get over some of his own issues as well. Only HTTYD and R/DoB are canon.

Chapters

 * 1) Anger Management
 * 2) The Stampede
 * 3) Final Blow
 * 4) Storm
 * 5) Adventure
 * 6) Weak and Worthless
 * 7) Deceiver
 * 8) Sold
 * 9) Last Adventure
 * 10) Fortis
 * 11) A Shot in the Right Direction
 * 12) Heart to Heart
 * 13) Memory Tree
 * If
 * 1) The Cave
 * 2) Free
 * 3) Home Sweet Home
 * 4) Redemption
 * 5) Extras!

Appearing characters

 * Adrianna Haddock
 * Astrid Hofferson
 * Benen
 * Bosley Ingerman
 * Erick Larson
 * Finn Haddock
 * Fishlegs Ingerman
 * Gobber
 * Heather Jorgenson
 * Hiccup Haddock
 * Holt
 * Inga Jorgenson
 * Javan the Deceiver
 * Olaf Larson
 * Pipsqueak
 * Ratri
 * Ruffnut Thorston
 * Snotlout Jorgenson
 * Stormfly
 * Svala Thorston
 * Toothless
 * Trader Johann
 * Tuffnut Thorston

Mentioned characters

 * Aida
 * Aud Larson
 * Bucket
 * Dagur the Deranged
 * Dagur's sister
 * Edgar
 * Frederik the Friendly
 * Gunnar Ingerman
 * Gustav Larson
 * Helga Ingerman
 * Kara the Kind
 * Lara Larson
 * Magnus Larson
 * Mulch
 * Peri Ingerman
 * Sigrid
 * Stoick the Vast
 * Zebah

Trivia

 * Timeline: The story takes place in July 1027


 * The grasshopper incident was based on a real-life situation at a summer camp