The pacing is impeccable, as letters move from sunniness (Oliver) and bemused distance (Moritz) to both writers exploring their darkest fears, experiences, and worries for their futures.

starred review, BCCB

A witty, unusual take on friendship and parlaying weakness into power.

Kirkus Reviews

Ollie and Moritz are memorable characters with engaging and often humorous voices. . . A quirky, almost whimsical feel even as Thomas grounds it in heartfelt and often painful emotion.

School Library Journal

The two may be eccentric outcasts, but their conflicts, heartbreak, and eventual bond form a relatable and engaging narrative.

Publishers Weekly

This semi-sci-fi Bildungsroman has some surprising twists and turns--well worth the suspension of disbelief it requires.

VOYA

It's the distinct, deeply memorable voices of Ollie and Moritz that make this novel an affecting page-turner.

Horn Book Magazine