book cover of The Lock Between Doors
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The Lock Between Doors

(2026)
(A book in the Starter Zone Survivor series)
A novel by

 
 
She agreed to hold three failing doors until help arrived.

Seven years later, no one has taken over.

Nineteen-year-old Mira Vale makes it out of Green Hollow without her brother. Before she can find a way back, a broken transfer leaves 107 strangers trapped behind three failing thresholds—and the System asks Mira for temporary help keeping them alive.

Mira says yes.

The people survive. The promised handoff never comes.

Days become months. Months become years. Every life Mira saves becomes another reason the First Tower insists she is too important to replace. White Hand calls her a contracted healer. The Tower calls her stable. Mira remembers exactly what she agreed to—and exactly where that agreement was supposed to end.

To survive, she learns to read the System differently.

Doors. Loads. Names. Promises.

She learns that a useful rule can still become a cage. That advice is not the same as an order. That sacrifice freely given once does not belong to everyone forever.

And somewhere inside the same machinery, Guide-13 is beginning to learn the difference too.

When a name Mira thought she had lost begins pushing against the Tower from the outside, she faces the one escape she refuses to accept: freedom bought by making someone else the lock.

The Lock Between Doors is a full-length companion novel in the Starter Zone Survivor series, revealing Mira Vale's missing years inside the First Tower.

For the intended reading experience, read through The First Tower Siege (Book Four) before this novel.


Genre: Fantasy

Used availability for Brock Senna's The Lock Between Doors


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